Philip of Brunswick-Grubenhagen
Philip of Brunswick-Grubenhagen (c. 1332 – 4 August 1369/1370) was Constable of Jerusalem. He belongs to the House of Welf. Life. He was son of Henry II, Duke of Brunswick-Grubenhagen called "de Graecia" and his second wife Heloise (Helwig, Helvis), daughter of Philip of Ibelin, Seneschal of Jerusalem. His father was the first son of Henry I, Duke of Brunswick-Lüneburg and his sons could succeed him in Grubenhagen, but four of them joined the church and the rest three obtained careers far away: Otto married Joanna I of Naples, Philip became Constable of Jerusalem  and Balthazar entitled "despot of Romania". Additionally they had no male offspring, thus the principality of Grubenhagen remained to Ernest I, Duke of Brunswick-Grubenhagen, younger brother of Henry II. Philip was nephew of Adelheid of Brunswick, wife of Andronikos III Palaiologos the Roman Emperor. Marriage and issue. He married firstly Helisia de Dampierre and had a daughter: Secondly he married Alix of Ibelin, the widow of Hugh IV of Cyprus. Because of the close relation, a Papal dispensation had been required for the marriage. There were no children from his 2nd marriage.