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The House of Gediminas were the siblings, children, and grandchildren of Gediminas, Grand Duke of Lithuania (ca. 1275–1341). The Gediminid dynasty ruled the Grand Duchy of Lithuania from ca. 1285 or 1316 to 1572, eventually extending its territories from the Baltic Sea to the Black Sea. Gediminas' origins are unclear, but recent research suggests that Skalmantas, an otherwise unknown historical figure, was Gediminas' grandfather or father, and could be considered the dynasty's founder. Because none of his brothers or sisters had known heirs, Gediminas, who sired at least twelve children, had the advantage in establishing sovereignty over his siblings. Known for his diplomatic skills, Gediminas arranged his children's marriages to suit the goals of his foreign policy: his sons consolidated Lithuanian power within the Grand Duchy of Lithuania, while his daughters established or strengthened alliances with the rulers of areas in modern-day Russia, Ukraine, and Poland. Gediminas' many grandchildren and their descendants engaged in power struggles that continued well into the 15th century. Gediminas' grandchildren converted Lithuania to Christianity and inaugurated the first personal union with Poland. The dynasty came to an end in 1572, when Sigismund II Augustus died without producing a male heir.