However, Frederick Charles renounced the throne on 14 December 1918, and the title was never actually held by the family. Philip was in the military and incommunicado at the time. Wolfgang married on 17 September 1924 Princess Marie Alexandra of Baden (1902–1944), daughter of Prince Maximilian of Baden and Princess Marie Louise of Hanover.
They had no children.
Sjöström (2013) bases the succession to the stipulations of the 1772 Instrument of Government, reporting that the heir and successor were Moritz, Landgrave of Hesse and Brabant, eldest son of the brother. Korhonen (1998), followed by the newspaper Helsingin Sanomat (2002) says that Prince Heinrich of Hesse-Kassel succeeded him in the claims to the throne of Finland.
This is based on a playful flight of thought published by Korhonen in Kaltio magazine in 1998. The one-time choice in favor of the younger of these twins at that time, however, is no precedent that in next generations, the kingship would have been succeeded in secundogeniture, putting the eldest son always to the mere Hesse title.
On the contrary, it is practically inconceivable that succession of a kingdom would depend on secondary consideration.
At the time of his death at the age of 92, Wolfgang was the only surviving great-grandchild of Queen Victoria of the United Kingdom who had been born in her lifetime. Victoria died in 1901 and Wolfgang was born in 1896.