On 01 Feb 1248 [his grandfather] Henry Reginar II Duke Brabant 1207-1248 (age 41) died. His son [his father] Henry Reginar III Duke Brabant 1230-1261 (age 18) succeeded III Duke Brabant. [his mother] Adelaide Burgundy Duchess Brabant 1233-1273 (age 15) by marriage Duchess Brabant.
In 1251 [his father] Henry Reginar III Duke Brabant 1230-1261 (age 21) and [his mother] Adelaide Burgundy Duchess Brabant 1233-1273 (age 18) were married. She the daughter of Hugh IV Duke Burgundy 1213-1272 (age 37) and Yolande Capet Duchess Burgundy 1212-1248. He the son of Henry Reginar II Duke Brabant 1207-1248 and . He a great x 4 grandson of King William "Conqueror" I of England. She a great x 5 granddaughter of King William "Conqueror" I of England.
Around 1251 Henry Reginar IV Duke Brabant was born to Henry Reginar III Duke Brabant 1230-1261 (age 21) and Adelaide Burgundy Duchess Brabant 1233-1273 (age 18).
On 28 Feb 1261 [his father] Henry Reginar III Duke Brabant 1230-1261 (age 31) died. His son Henry Reginar IV Duke Brabant (age 10) succeeded IV Duke Brabant.
After 1272 Henry Reginar IV Duke Brabant (age 21) died. His brother [his brother] John Reginar I Duke Brabant 1253-1294 (age 19) succeeded I Duke Brabant.
Paternal Family Tree: Reginar aka Percy
Maternal Family Tree: Beatrice St Pol Countess Ponthieu 1145-1204
Kings Wessex: Great x 7 Grand Son of King Edmund "Ironside" I of England
Kings England: Great x 5 Grand Son of King William "Conqueror" I of England
Kings Scotland: Great x 5 Grand Son of Malcolm III King Scotland
Kings Franks: Great x 12 Grand Son of Louis "Pious" King Aquitaine I King Franks
Kings France: Great x 4 Grand Son of Louis "Fat" VI King France
Great x 4 Grandfather: Godfrey Reginar I Count Louvain
Great x 3 Grandfather: Godfrey Reginar VII Duke Lower Lorraine 1107-1142
Great x 2 Grandfather: Godfrey Reginar VIII Duke Lower Lorraine 1142-1190
Great x 1 Grandfather: Henry Reginar VIII Duke Lower Lorraine I Duke Brabant
Great x 4 Grandfather: Waleran "Pagan" Luxemburg Duke Lower Lorraine 1085-1139
Great x 3 Grandfather: Henry Luxemburg II Duke Limburg 1111-1167
Great x 2 Grandmother: Margaret Luxemburg Duchess Lower Lorraine 1138-1173
GrandFather: Henry Reginar II Duke Brabant 1207-1248 3 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: Theodoric "Valiant" Metz II Duke Lorraine 1055-1115
Great x 3 Grandfather: Thierry Metz Count Flanders 1099-1168
Great x 4 Grandmother: Gertrude Flanders Duchess Lorraine 1080-1117
Great x 2 Grandfather: Matthew Metz Count Boulogne
Great x 4 Grandfather: Fulk "Young" King Jerusalem
Great x 3 Grandmother: Sibylla Anjou Countess Essex and Flanders
Great x 1 Grandmother: Maud Metz 2 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Stephen Blois II Count Blois and Chartres 1045-1102
Great x 3 Grandfather: King Stephen I England Grand Son of King William "Conqueror" I of England
Great x 4 Grandmother: Adela Normandy Countess Blois 1067-1137
Daughter of King William "Conqueror" I of England
Great x 2 Grandmother: Marie Blois I Countess Boulogne Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Eustace Flanders III Count Boulogne
Great x 3 Grandmother: Matilda Flanders
Great x 4 Grandmother: Mary Dunkeld Countess Boulogne 1082-1116
Father: Henry Reginar III Duke Brabant 1230-1261 4 x Great Grand Son of King William "Conqueror" I of England
Henry Reginar IV Duke Brabant 1251-1272 5 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: Hugh II Duke Burgundy 1084-1143
Great x 3 Grandfather: Odo II Duke Burgundy 1118-1162
Great x 2 Grandfather: Hugh III Duke Burgundy 1142-1192 2 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: Theobald Blois II Count Champagne IV Count Blois Grand Son of King William "Conqueror" I of England
Great x 3 Grandmother: Marie Blois Duchess Burgundy Great Grand Daughter of King William "Conqueror" I of England
Great x 1 Grandfather: Odo III Duke Burgundy 3 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: Simon Metz I Duke Lorraine 1076-1139
Great x 3 Grandfather: Matthias Metz I Duke Lorraine 1119-1176
Great x 4 Grandmother: Adelaide Reginar Duchess Lorraine
Great x 2 Grandmother: Alice Metz Duchess Burgundy -1200
Great x 4 Grandfather: Frederick "One Eyed" Hohenstaufen I Holy Roman Emperor
Great x 3 Grandmother: Bertha aka Judith Hohenstaufen Duchess Lorraine 1123-1195
Great x 4 Grandmother: Judith Welf Holy Roman Empress 1100-1130
GrandFather: Hugh IV Duke Burgundy 1213-1272 4 x Great Grand Son of King William "Conqueror" I of England
Mother: Adelaide Burgundy Duchess Brabant 1233-1273 5 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Louis "Fat" VI King France
Great x 3 Grandfather: Robert "Great" Capet I Count Dreux
Great x 4 Grandmother: Adelaide Savoy Queen Consort France -1154
Great x 2 Grandfather: Robert Capet II Count Dreux
Great x 1 Grandfather: Robert Capet III Count Dreux 1185-1234
Great x 4 Grandfather: Enguerrand Coucy
Great x 3 Grandfather: Raoul Coucy
Great x 4 Grandmother: Agnes Beaugency
Great x 4 Grandfather: Baldwin Flanders IV Count Hainault 1108-1171
Great x 3 Grandmother: Agnes Flanders
GrandMother: Yolande Capet Duchess Burgundy 1212-1248
Great x 4 Grandfather: Reginald St Valery
Great x 3 Grandfather: Bernard St Valery
Great x 2 Grandfather: Thomas St Valery
Great x 3 Grandmother: Eleanor Donart
Great x 4 Grandfather: Guy Montgomery II Count Ponthieu 1120-1147
Great x 3 Grandfather: John Montgomery I Count Ponthieu 1140-1191
Great x 2 Grandmother: Adele Ponthieu