Biography of Otto Welf IV Holy Roman Emperor 1175-1218

Paternal Family Tree: Obertenghi aka Welf

Maternal Family Tree: Dangereuse Ile Bouchard Viscountess Chatellerault 1079-1151

Otto Welf IV was appointed IV Holy Roman Emperor.

Otto Welf IV was appointed IV Duke Swabia.

In 1147 [his father] Henry "Lion" Welf XII Duke Saxony III Duke Bavaria (age 18) and Clementia Zähringen Duchess Saxony Duchess Bavaria were married. They divorceddd in 1162. She the daughter of Conrad Zähringen 1st Duke Zähringen. He the son of [his grandfather] Henry "Proud" Welf X Duke Bavaria and [his grandmother] Gertrude Süpplingenburg Duchess Bavaria.

On 1st February 1168 [his father] Henry "Lion" Welf XII Duke Saxony III Duke Bavaria (age 39) and [his mother] Matilda Plantagenet Duchess Saxony (age 12) were married. She by marriage Duchess Bavaria, Duchess Saxony. The difference in their ages was 27 years. She the daughter of [his grandfather] King Henry "Curtmantle" II of England (age 34) and [his grandmother] Eleanor of Aquitaine Queen Consort Franks and England (age 46). He the son of [his grandfather] Henry "Proud" Welf X Duke Bavaria and [his grandmother] Gertrude Süpplingenburg Duchess Bavaria. They were half third cousin twice removed.

Around 1175 Otto Welf IV was born to [his father] Henry "Lion" Welf XII Duke Saxony III Duke Bavaria (age 46) and [his mother] Matilda Plantagenet Duchess Saxony (age 18). He a grandson of King Henry "Curtmantle" II of England.

In 1189 [his brother-in-law] Geoffrey Chateaudun III Count Perche and [his sister] Matilda Welf Countess Perche (age 17) were married at Rouen, France [Map]. She by marriage Countess Perche. She the daughter of [his father] Henry "Lion" Welf XII Duke Saxony III Duke Bavaria (age 60) and [his mother] Matilda Plantagenet Duchess Saxony (age 32). He the son of Routrou Chateaudun IV Count Perche (age 54) and Matilda Blois Countess Perche. They were third cousin once removed. He a great x 2 grandson of King William "Conqueror" I of England. She a granddaughter of King Henry "Curtmantle" II of England.

On 28th June 1189 [his mother] Matilda Plantagenet Duchess Saxony (age 33) died. She was buried at Brunswick Cathedral [Map].

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On 6th August 1195 [his father] Henry "Lion" Welf XII Duke Saxony III Duke Bavaria (age 66) died at Ravensburg. Otto Wittelsbach I Duke Bavaria succeeded I Duke Bavaria. Agnes Loon Duchess Bavaria by marriage Duchess Bavaria.

In 1204 [his sister] Matilda Welf Countess Perche (age 32) died.

In 1204 [his brother-in-law] Enguerrand Coucy III Lord Coucy (age 22) and [his sister] Matilda Welf Countess Perche (age 32) were married. She by marriage Lord Coucy. She the daughter of [his father] Henry "Lion" Welf XII Duke Saxony III Duke Bavaria and [his mother] Matilda Plantagenet Duchess Saxony. They were half fifth cousins. She a granddaughter of King Henry "Curtmantle" II of England.