https://en.wikipedia.org/wiki/%C5%A0vitrigaila
Belongs to House of Gediminas. Son of Algirdas. Grandson of Gediminas. Wikipedia got public domain image.
Came to power after death of Vytautas. Lost power two years later during another civil war, but retained title of Prince of Volhynia til his death. Had coins with letter B in columns of Gediminas. Differ from Vytautas, who used A and Casimir IV, who used K.
If you want consistency with English, you might rename House of Gediminas • Vytautas the Great (1392-1430) to just Vytautas. He is the Great in Lithuania, but just Witold in Poland.