,
born at Ravensberg [Baden-Württemberg, Germany] around 1075,
Graaf van Ravensberg (Graafschap) from 1100 to 1144,
died (around 69 years old) around 1144.
,
son of Herman Ivan Calvelage and Frederunavan Vreden,
born around 1025,
Graaf van Westmunsterland,
died (around 57 years old) in 1082,
marries (resp. around 45 and around 18 years old) in 1070 with