Paternal Family Tree: Hesse
Maternal Family Tree: Antoinette Polignac 1460-
Before 29th March 1674 [his father] Charles I Landgrave Hesse-Kassel [aged 19] and [his mother] Maria Amalia of Courland Landgravine Hesse-Kassel [aged 20] were married. She by marriage Landgravine Hesse Kassel. He the son of [his grandfather] Wilhelm "The Just" VI Hesse-Kassel and [his grandmother] Hedwig Sophia Hohenzollern [aged 50]. They were first cousins.
On 28th April 1676 Frederick I King Sweden was born to Charles I Landgrave Hesse-Kassel [aged 21] and Maria Amalia of Courland Landgravine Hesse-Kassel [aged 22]. Coefficient of inbreeding 7.10%.
In 1700 Frederick I King Sweden [aged 23] and Louise Dorothea Hohenzollern [aged 19] were married. She the daughter of Frederick I King Prussia [aged 42] and Elisabeth Henriëtte Hesse-Kassel. He the son of Charles I Landgrave Hesse-Kassel [aged 45] and Maria Amalia of Courland Landgravine Hesse-Kassel [aged 46]. They were first cousins.
On 2nd January 1704 [his brother-in-law] Frederick William I Duke Mecklenburg-Schwerin [aged 28] and [his sister] Sophie Charlotte Hesse-Kassel Duchess Mecklenburg-Schwerin [aged 25] were married. She by marriage Duchess Mecklenburg Schwerin. She the daughter of [his father] Charles I Landgrave Hesse-Kassel [aged 49] and [his mother] Maria Amalia of Courland Landgravine Hesse-Kassel [aged 50]. They were fourth cousins.
On 23rd December 1705 [his wife] Louise Dorothea Hohenzollern [aged 25] died in childbirth.
On 16th June 1711 [his mother] Maria Amalia of Courland Landgravine Hesse-Kassel [aged 58] died.
In 1715 Frederick I King Sweden [aged 38] and Ulrika Eleonora Palatinate Zweibrücken Queen Consort Sweden [aged 26] were married. She the daughter of Charles XI King Sweden and Ulrika Eleonora Oldenburg. He the son of Charles I Landgrave Hesse-Kassel [aged 60] and Maria Amalia of Courland Landgravine Hesse-Kassel. They were third cousin once removed.
On 11th December 1718 [his brother-in-law] Charles XII King of Sweden [aged 36] was killed whilst in the trenches around Fredriksten which his army was besieging. He was struck in the head by a projectile and killed. The shot struck the left side of his skull and exited from the right. It isn't clear who fired the shot. His sister Ulrika [aged 30] succeeded Queen Sweden. She effectively usurped her nephew Charles Frederick Duke of Holstein Gottorp [aged 18] whose parents were both dead.
On 29th February 1720 Ulrika Eleonora Palatinate Zweibrücken Queen Consort Sweden [aged 32] abdicated King Sweden. On 24th March 1720 her husband Frederick I King Sweden [aged 43] was appointed I King Sweden.
On 23rd March 1730 [his father] Charles I Landgrave Hesse-Kassel [aged 75] died.
On 24th November 1741 Ulrika Eleonora Palatinate Zweibrücken Queen Consort Sweden [aged 53] died.
On 30th May 1749 [his sister] Sophie Charlotte Hesse-Kassel Duchess Mecklenburg-Schwerin [aged 70] died.
On 5th April 1751 Frederick I King Sweden [aged 74] died. His third cousin once removed Adolph [aged 40] succeeded King Sweden. He the first king of the House of Holstein-Gottorp.
Kings Wessex: Great x 19 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 18 Grand Son of Owain "Great" King Gwynedd
Kings Seisyllwg: Great x 24 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 19 Grand Son of Maredudd ap Bleddyn King Powys
Kings Godwinson: Great x 18 Grand Son of King Harold II of England
Kings England: Great x 10 Grand Son of King Edward III of England
Kings Scotland: Great x 17 Grand Son of King Malcolm III of Scotland
Kings France: Great x 9 Grand Son of King Charles V of France
Kings Duke Aquitaine: Great x 23 Grand Son of Ranulf I Duke Aquitaine
Kings Spain: Great x 7 Grand Son of John II King Aragon
Great x 4 Grandfather: Landgrave Philip I of Hesse 10 x Great Grandson of King Henry "Curtmantle" II of England
Great x 3 Grandfather: William IV Landgrave of Hesse-Kassel 8 x Great Grandson of King Philip III of France
Great x 4 Grandmother: Christine of Saxony 7 x Great Granddaughter of King Philip III of France
Great x 2 Grandfather: Landgrave Maurice of Hesse-Kassel 9 x Great Grandson of King Philip III of France
Great x 1 Grandfather: Landgrave William V of Hesse-Kassel 10 x Great Grandson of King Philip III of France
Grandfather: Wilhelm "The Just" VI Hesse-Kassel 11 x Great Grandson of King Philip III of France
Father: Charles I Landgrave Hesse-Kassel 7 x Great Grandson of John II King Aragon
Great x 4 Grandfather: John George Hohenzollern Margrave of Brandenburg 9 x Great Grandson of King Philip III of France
Great x 3 Grandfather: Joachim Frederick Hohenzollern 10 x Great Grandson of King Philip III of France
Great x 4 Grandmother: Princess Sophie of Legnica
Great x 2 Grandfather: John Sigismund Hohenzollern 11 x Great Grandson of King Philip III of France
Great x 1 Grandfather: George William Hohenzollern 5 x Great Grandson of John II King Aragon
Great x 4 Grandfather: Albert "The Elder" Hohenzollern I Duke Prussia 7 x Great Grandson of King Philip III of France
Great x 3 Grandfather: Albert Frederick Hohenzollern Duke Prussia 8 x Great Grandson of King Philip III of France
Great x 4 Grandmother: Anna Maria Guelph Duchess Prussia 9 x Great Granddaughter of King Henry "Curtmantle" II of England
Great x 2 Grandmother: Anna Hohenzollern 4 x Great Granddaughter of John II King Aragon
Great x 4 Grandfather: William de la Marck Duke of Jülich Cleves Berg 5 x Great Grandson of King John "The Good" II of France
Great x 3 Grandmother: Marie Eleonore de la Marck 3 x Great Granddaughter of John II King Aragon
Great x 4 Grandmother: Maria Habsburg Spain Duchess Cleves 2 x Great Granddaughter of John II King Aragon
Grandmother: Hedwig Sophia Hohenzollern 6 x Great Granddaughter of John II King Aragon
Great x 4 Grandfather: Frederick III Elector Palatine 
6 x Great Grandson of King John "The Good" II of France
Great x 3 Grandfather: Louis VI Elector Palatine 7 x Great Grandson of King John "The Good" II of France
Great x 2 Grandfather: Frederick IV Elector Palatine 8 x Great Grandson of King John "The Good" II of France
Great x 1 Grandmother: Elisabeth Charlotte Palatinate Simmern 
6 x Great Granddaughter of King Charles V of France
Great x 4 Grandfather: William "The Rich" I Count of Nassau Dillenburg
Great x 3 Grandfather: William "The Silent" Orange Nassau I Prince Orange
Great x 2 Grandmother: Electress Louise Juliana of the Palatine Rhine 5 x Great Granddaughter of King Charles V of France
Great x 4 Grandfather: Louis Duke of Montpensier 
4 x Great Grandson of King John "The Good" II of France
Great x 3 Grandmother: Charlotte Bourbon Princess Orange 4 x Great Granddaughter of King Charles V of France
Great x 4 Grandmother: Jacqueline de Longwy 3 x Great Granddaughter of King Charles V of France
Frederick I King Sweden 7 x Great Grandson of John II King Aragon
Great x 2 Grandfather: Gotthard Kettler
Great x 1 Grandfather: William Kettler Duke Courland 10 x Great Grandson of King Philip III of France
Great x 4 Grandfather: Magnus II Duke of Mecklenburg
Great x 3 Grandfather: Albrecht VII Duke Mecklenburg
Great x 2 Grandmother: Anna Mecklenburg-Schwerin 9 x Great Granddaughter of King Philip III of France
Great x 4 Grandfather: Joachim "Nestor" Hohenzollern Elector Brandenburg 7 x Great Grandson of King Philip III of France
Great x 3 Grandmother: Anna Hohenzollern Duchess Mecklenburg 8 x Great Granddaughter of King Philip III of France
Grandfather: Jacob Kettler 5 x Great Grandson of John II King Aragon
Great x 4 Grandfather: Frederick Hohenzollern I Margrave Brandenburg-Ansbach
Great x 3 Grandfather: Albert "The Elder" Hohenzollern I Duke Prussia 7 x Great Grandson of King Philip III of France
Great x 4 Grandmother: Sophia Jagiellon Margravine of Brandenburg-Ansbach 6 x Great Granddaughter of King Philip III of France
Great x 2 Grandfather: Albert Frederick Hohenzollern Duke Prussia 8 x Great Grandson of King Philip III of France
Great x 4 Grandfather: Eric "The Elder" Guelph I Duke Brunswick-Lüneburg 8 x Great Grandson of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Anna Maria Guelph Duchess Prussia 9 x Great Granddaughter of King Henry "Curtmantle" II of England
Great x 1 Grandmother: Sophie Hohenzollern 4 x Great Granddaughter of John II King Aragon
Great x 4 Grandfather: John de la Marck III Duke Cleves 4 x Great Grandson of King John "The Good" II of France
Great x 3 Grandfather: William de la Marck Duke of Jülich Cleves Berg 5 x Great Grandson of King John "The Good" II of France
Great x 4 Grandmother: Maria Jülich Berg Duchess Cleves
Great x 2 Grandmother: Marie Eleonore de la Marck 3 x Great Granddaughter of John II King Aragon
Great x 4 Grandfather: Ferdinand I Holy Roman Emperor Great Grandson of John II King Aragon
Great x 3 Grandmother: Maria Habsburg Spain Duchess Cleves 2 x Great Granddaughter of John II King Aragon
Great x 4 Grandmother: Anne Jagiellon 2 x Great Granddaughter of John II King Aragon
Mother: Maria Amalia of Courland Landgravine Hesse-Kassel 6 x Great Granddaughter of John II King Aragon
Great x 4 Grandfather: John George Hohenzollern Margrave of Brandenburg 9 x Great Grandson of King Philip III of France
Great x 3 Grandfather: Joachim Frederick Hohenzollern 10 x Great Grandson of King Philip III of France
Great x 4 Grandmother: Princess Sophie of Legnica
Great x 2 Grandfather: John Sigismund Hohenzollern 11 x Great Grandson of King Philip III of France
Great x 1 Grandfather: George William Hohenzollern 5 x Great Grandson of John II King Aragon
Great x 4 Grandfather: Albert "The Elder" Hohenzollern I Duke Prussia 7 x Great Grandson of King Philip III of France
Great x 3 Grandfather: Albert Frederick Hohenzollern Duke Prussia 8 x Great Grandson of King Philip III of France
Great x 4 Grandmother: Anna Maria Guelph Duchess Prussia 9 x Great Granddaughter of King Henry "Curtmantle" II of England
Great x 2 Grandmother: Anna Hohenzollern 4 x Great Granddaughter of John II King Aragon
Great x 4 Grandfather: William de la Marck Duke of Jülich Cleves Berg 5 x Great Grandson of King John "The Good" II of France
Great x 3 Grandmother: Marie Eleonore de la Marck 3 x Great Granddaughter of John II King Aragon
Great x 4 Grandmother: Maria Habsburg Spain Duchess Cleves 2 x Great Granddaughter of John II King Aragon
Grandmother: Louise Charlotte Hohenzollern 6 x Great Granddaughter of John II King Aragon
Great x 4 Grandfather: Frederick III Elector Palatine 6 x Great Grandson of King John "The Good" II of France
Great x 3 Grandfather: Louis VI Elector Palatine 7 x Great Grandson of King John "The Good" II of France
Great x 2 Grandfather: Frederick IV Elector Palatine 8 x Great Grandson of King John "The Good" II of France
Great x 1 Grandmother: Elisabeth Charlotte Palatinate Simmern 6 x Great Granddaughter of King Charles V of France
Great x 4 Grandfather: William "The Rich" I Count of Nassau Dillenburg
Great x 3 Grandfather: William "The Silent" Orange Nassau I Prince Orange
Great x 2 Grandmother: Electress Louise Juliana of the Palatine Rhine 5 x Great Granddaughter of King Charles V of France
Great x 4 Grandfather: Louis Duke of Montpensier 4 x Great Grandson of King John "The Good" II of France
Great x 3 Grandmother: Charlotte Bourbon Princess Orange 4 x Great Granddaughter of King Charles V of France
Great x 4 Grandmother: Jacqueline de Longwy 3 x Great Granddaughter of King Charles V of France