Paternal Family Tree: Capet
Maternal Family Tree: Elisabeth of Brunswick-Wolfenbüttel Holy Roman Empress 1691-1750
On 16th May 1770 [his father] Louis XVI King France [aged 15] and [his mother] Queen Marie Antoinette of France [aged 14] were married. She the daughter of [his grandfather] Francis I Holy Roman Emperor and [his grandmother] Maria Theresa Habsburg Spain Holy Roman Empress [aged 53]. They were second cousin once removed. He a great x 4 grandson of King Charles I of England, Scotland and Ireland. She a great x 4 granddaughter of King James I of England and Ireland and VI of Scotland.
On 27th March 1785 Louis XVII King France was born to Louis XVI King France [aged 30] and Queen Marie Antoinette of France [aged 29]. Coefficient of inbreeding 1.65%. He died aged ten in 1795.
On 21st January 1793 [his father] Louis XVI King France [aged 38] was guillotined in Paris [Map]. His son Louis [aged 7] de jure XVII King France: Capet Valois Bourbon.
On 16th October 1793 at 12:15 [his mother] Queen Marie Antoinette of France [aged 37] was guillotined at the Place de la Révolution. Her last words were "Pardonnez-moi, monsieur. Je ne l'ai pas fait exprès" or "Pardon me, sir, I did not do it on purpose" after she accidentally stepped on the executioners shoe.
On 8th June 1795 Louis XVII King France [aged 10] died. His uncle Louis [aged 39] de jure XVIII King France: Capet Valois Bourbon.
Kings Wessex: Great x 21 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 19 Grand Son of Owain "Great" King Gwynedd
Kings Seisyllwg: Great x 25 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 20 Grand Son of Maredudd ap Bleddyn King Powys
Kings Godwinson: Great x 20 Grand Son of King Harold II of England
Kings England: Great x 5 Grand Son of King Charles I of England, Scotland and Ireland
Kings Scotland: Great x 5 Grand Son of King Charles I of England, Scotland and Ireland
Kings France: Son of Louis XVI King France
Kings Duke Aquitaine: Great x 25 Grand Son of Ranulf I Duke Aquitaine
Kings Spain: Grand Son of Maria Theresa Habsburg Spain Holy Roman Empress
Great x 4 Grandfather: Louis "Sun King" XIV King France 
son of Louis XIII King France
Great x 3 Grandfather: Louis "Le Grand Dauphin" Bourbon Duke Burgundy son of Louis "Sun King" XIV King France
Great x 4 Grandmother: Maria Theresa of Spain Queen Consort France daughter of Philip IV King Spain
Great x 2 Grandfather: Louis Bourbon Duke Burgundy Grandson of Louis "Sun King" XIV King France
Great x 4 Grandfather: Ferdinand Maria Wittelsbach 
Grandson of Ferdinand of Spain II Holy Roman Emperor
Great x 3 Grandmother: Maria Anna Victoria Wittelsbach Duchess Burgundy Great Granddaughter of Ferdinand of Spain II Holy Roman Emperor
Great x 4 Grandmother: Henriette Adelaide Savoy
Great x 1 Grandfather: Louis XV King France Great Grandson of Louis "Sun King" XIV King France
Great x 4 Grandfather: Charles Emmanuel II Duke of Savoy Grandson of Henry IV King France
Great x 3 Grandfather: Victor Amadeus King Sardinia Great Grandson of Henry IV King France
Great x 4 Grandmother: Marie Jeanne Baptiste of Savoy Great Granddaughter of Henry IV King France
Great x 2 Grandmother: Maria Adelaide Savoy Great Granddaughter of Louis XIII King France
Great x 4 Grandfather: Philip Bourbon I Duke Orléans son of Louis XIII King France
Great x 3 Grandmother: Anne Marie Bourbon Queen Consort Sardinia Granddaughter of Louis XIII King France
Great x 4 Grandmother: Princess Henrietta Stewart Duchess Orléans 
daughter of King Charles I of England, Scotland and Ireland
Grandfather: Dauphin Louis Bourbon son of Louis XV King France
Great x 1 Grandmother: Marie Leszczyńska Queen Consort France
father: Louis XVI King France Grandson of Louis XV King France
Great x 4 Grandfather: John George Wettin Elector Saxony 5 x Great Grandson of John II King Aragon
Great x 3 Grandfather: John George Wettin III Elector Saxony 6 x Great Grandson of John II King Aragon
Great x 2 Grandfather: Frederick Augutus Elector Saxony King of Poland 7 x Great Grandson of John II King Aragon
Great x 4 Grandfather: Frederick III King of Denmark 
11 x Great Grandson of King Philip III of France
Great x 3 Grandmother: Anna Sophie Oldenburg 12 x Great Granddaughter of King Philip III of France
Great x 4 Grandmother: Sophie Amalie Hanover Queen Consort Denmark 
11 x Great Granddaughter of King Philip III of France
Great x 1 Grandfather: Augustus III King Poland 8 x Great Grandson of John II King Aragon
Grandmother: Dauphine Maria Josepha of France Great Granddaughter of Leopold Habsburg Spain I Holy Roman Emperor
Great x 4 Grandfather: Ferdinand III Holy Roman Emperor son of Ferdinand of Spain II Holy Roman Emperor
Great x 3 Grandfather: Leopold Habsburg Spain I Holy Roman Emperor son of Maria Anna of Spain Holy Roman Empress
Great x 4 Grandmother: Maria Anna of Spain Holy Roman Empress daughter of Philip III King Spain
Great x 2 Grandfather: Joseph I Holy Roman Emperor son of Leopold Habsburg Spain I Holy Roman Emperor
Great x 4 Grandfather: Philip William Elector Palatine 5 x Great Grandson of John II King Aragon
Great x 3 Grandmother: Eleonore Magdalene of Neuburg 6 x Great Granddaughter of John II King Aragon
Great x 4 Grandmother: Elizabeth Amalie of Hesse Darmstadt 6 x Great Granddaughter of John II King Aragon
Great x 1 Grandmother: Maria Josepha of Austria Granddaughter of Leopold Habsburg Spain I Holy Roman Emperor
Great x 4 Grandfather: George Hanover Duke Brunswick-Lüneburg
Great x 3 Grandfather: Johann Friedrich Hanover 11 x Great Grandson of King Philip III of France
Great x 4 Grandmother: Anne Eleonore Hesse Darmstadt Duchess Brunswick-Lüneburg 10 x Great Granddaughter of King Philip III of France
Great x 2 Grandmother: Wilhelmine Amalie of Brunswick 2 x Great Granddaughter of King James I of England and Ireland and VI of Scotland
Great x 4 Grandfather: Edward Palatinate Simmern Grandson of King James I of England and Ireland and VI of Scotland
Great x 3 Grandmother: Benedicta Henrietta Palatinate Simmern 
Great Granddaughter of King James I of England and Ireland and VI of Scotland
Louis XVII King France son of Louis XVI King France
Great x 4 Grandfather: Francis Lorraine II Duke Lorraine Grandson of King Henry II of France
Great x 3 Grandfather: Nicolas Lorraine II Duke Lorraine Great Grandson of King Henry II of France
Great x 2 Grandfather: Charles V Duke of Lorraine 2 x Great Grandson of King Henry II of France
Great x 1 Grandfather: Leopold Duke of Lorraine 3 x Great Grandson of King Henry II of France
Grandfather: Francis I Holy Roman Emperor Great Grandson of Louis XIII King France
Great x 4 Grandfather: Henry IV King France 3 x Great Grandson of Charles "Victorious" VII King France
Great x 3 Grandfather: Louis XIII King France son of Henry IV King France
Great x 4 Grandmother: Marie de Medici Queen Consort France 3 x Great Granddaughter of John II King Aragon
Great x 2 Grandfather: Philip Bourbon I Duke Orléans son of Louis XIII King France
Great x 4 Grandfather: Philip III King Spain son of Philip "The Prudent" II King Spain
Great x 3 Grandmother: Anne of Austria Spain Queen Consort France daughter of Philip III King Spain
Great x 4 Grandmother: Margaret of Austria Queen Consort Spain 3 x Great Granddaughter of John II King Aragon
Great x 1 Grandmother: Élisabeth Charlotte Bourbon Duchess Lorraine Granddaughter of Louis XIII King France
Great x 4 Grandfather: Frederick Palatinate Simmern V Elector Palatine Rhine 6 x Great Grandson of King Charles V of France
Great x 3 Grandfather: Charles Louis Palatinate Simmern Grandson of King James I of England and Ireland and VI of Scotland
Great x 4 Grandmother: Princess Elizabeth Stewart Queen Bohemia daughter of King James I of England and Ireland and VI of Scotland
Great x 2 Grandmother: Elizabeth Charlotte Palatinate Simmern Duchess Orléans Great Granddaughter of King James I of England and Ireland and VI of Scotland
Great x 4 Grandfather: Landgrave William V of Hesse-Kassel 10 x Great Grandson of King Philip III of France
Great x 3 Grandmother: Charlotte Hesse-Kassel 11 x Great Granddaughter of King Philip III of France
mother: Queen Marie Antoinette of France daughter of Maria Theresa Habsburg Spain Holy Roman Empress
Great x 4 Grandfather: Ferdinand of Spain II Holy Roman Emperor 3 x Great Grandson of John II King Aragon
Great x 3 Grandfather: Ferdinand III Holy Roman Emperor son of Ferdinand of Spain II Holy Roman Emperor
Great x 4 Grandmother: Maria Anna Wittelsbach Holy Roman Empress 4 x Great Granddaughter of John II King Aragon
Great x 2 Grandfather: Leopold Habsburg Spain I Holy Roman Emperor son of Maria Anna of Spain Holy Roman Empress
Great x 4 Grandfather: Philip III King Spain son of Philip "The Prudent" II King Spain
Great x 3 Grandmother: Maria Anna of Spain Holy Roman Empress daughter of Philip III King Spain
Great x 4 Grandmother: Margaret of Austria Queen Consort Spain 3 x Great Granddaughter of John II King Aragon
Great x 1 Grandfather: Charles Habsburg Spain VI Holy Roman Emperor son of Leopold Habsburg Spain I Holy Roman Emperor
Great x 4 Grandfather: Wolfgang Wilhelm Count Palatine of Neuburg 4 x Great Grandson of John II King Aragon
Great x 3 Grandfather: Philip William Elector Palatine 5 x Great Grandson of John II King Aragon
Great x 2 Grandmother: Eleonore Magdalene of Neuburg 6 x Great Granddaughter of John II King Aragon
Great x 4 Grandfather: Landgrave George II of Hesse-Darmstadt 10 x Great Grandson of King Philip III of France
Great x 3 Grandmother: Elizabeth Amalie of Hesse Darmstadt 6 x Great Granddaughter of John II King Aragon
Great x 4 Grandmother: Sophie Eleonore of Saxony 5 x Great Granddaughter of John II King Aragon
Grandmother: Maria Theresa Habsburg Spain Holy Roman Empress daughter of Charles Habsburg Spain VI Holy Roman Emperor
Great x 4 Grandfather: Augustus II Duke of Brunswick-Lüneburg 12 x Great Grandson of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Anthony Ulrich Duke of Brunswick-Lüneburg 13 x Great Grandson of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Louis Rudolph 14 x Great Grandson of King Henry "Curtmantle" II of England
Great x 1 Grandmother: Elisabeth of Brunswick-Wolfenbüttel Holy Roman Empress 15 x Great Granddaughter of King Henry "Curtmantle" II of England