The ships ae named after the chief cities of the Piast dynasty.
Selencia is mentioned twice in the first book of Gallus Anonymus' Gesta principum Polonorum (The Poles' princes' deeds), a chronicle composed in Piast Poland between 1112 and 1118 to glorify the Piast dynasty in general, and the contemporary Piast ruler Boleslaw III Wrymouth in particular.
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At the same time when the Kingdom of Germany grew out of the German stem duchies of East Francia in the 10th century, the West Slavic Polan tribes under the Piast prince Mieszko I about 960 were able to establish a sovereign state around Poznan and Gniezno in an area later called Greater Poland.
Formerly, in the period of the rule of the first monarchs of Piast State, like also before Baptism of Poland in 966, in the 10th century Płock as the capital castle were one of monarchal seats, among others of prince Mieszko I and of king Bolesław I Chrobry, which on the Płock Tumskie Hill over the Vistula River raised one's palatium.
Janusz III of Masovia (1502–1526), son of Konrad III Rudy, last male of the Masovian Piast dynasty