On the death of his brother Duke Christian of Schleswig-Holstein at Ærø in 1633, he inherited that island, as well as the town of Koping (Ærøskøbing), the district of Wuderup (Vodrup) and the domain of Gravenstein (Gråsten).[4] That year, however, he ceded the last to his elder brother Frederick, Duke of Schleswig-Holstein-Sønderburg-Norburg, who had remained landless until he inherited Norburg in 1624 upon the death of their elder brother, Duke John Adolf. Frederick, however, returned Gravenstein to Philip in 1635 or 1636. The Æero appanage remained hereditary in Philip's branch of the dynasty until being purchased by their kinsman Frederick V of Denmark in 1749, who dissolved it as a fideicommis in 1767. Philip also purchased the domain of Freinwillen in Schleswig which he gave to his unmarried youngest (surviving) daughter Hedwig (1640-1671). In 1648, Philipp bought, from Hans von Ahlefeld, another domain called Gravenstein located, however, in the Sundeved north of the Flensburg Fjord. He did not retain that estate as part of his duchy, however, re-selling it in 1662 to Frederick von Ahlefeld.[1]
On 23 May 1624, Philip married Sophie Hedwig of Saxe-Lauenburg (1601–1660), daughter of Francis II, Duke of Saxe-Lauenburg. They had the following children:[1]
Duke John of Schleswig-Holstein-Glücksburg (23 July 1625 – 4 December 1640)
Duke Francis of Schleswig-Holstein-Glücksburg (20 August 1626 – 3 August 1651)
^ abcdHuberty, Michel; Giraud, Alain; Magdelaine, F. and B. (1994). L'Allemagne Dynastique, Tome VII -- Oldenbourg (in French). France: Laballery. pp. 27–28, 32, 46–48, 64–66. ISBN2-901138-07-1.
