During an internal struggle in 1250, Mindaugas allied himself with the
Livonian Order and the
Teutonic Knights. With the assistance of the Orders, he defeated his rivals, converted to Christianity, and was crowned King of Lithuania in 1253. In return for their support, Mindaugas granted various lands to the Knights in 1253, 1255, 1257, 1259, 1260, and 1261. These six charters have sparked considerable controversy and debate among modern historians regarding their authenticity. Only one document, the October 1255 act concerning
Selonia, has survived with Mindaugas’ seal. This Selonian act was also referenced by
Pope Alexander IV in a papal bull dated July 13, 1257, which confirmed the territorial transfer. In May 1393, a papal legate produced a transcript and a detailed description of the seal. The description matches the surviving seal closely, with the sole difference being the color of the string attaching the seal to the parchment: the legate described it as white and yellow, while today it appears white and blue. The original document is preserved in the
Prussian Privy State Archives. The seal measures about 85 millimetres (3.3 in) in diameter, though its exact size is uncertain due to chipped edges. It depicts a ruler seated on a bench, covered with a cushion or drapery. The ruler is shown wearing a royal mantle and a crown. In his right hand he holds a scepter topped with a large lily, while in his left he holds an
orb surmounted by a cross. The empty field around the figure is filled with Gothic diamond-shaped latticework, each diamond containing a small cross at its center. The legend, which should have contained Mindaugas’ name and title, is almost entirely destroyed. Only a small cross, marking the beginning of the inscription, and a single letter remain, which has been variously interpreted as M, D, or SI. According to the 1393 description, when the legend was still intact it read: + MYNDOUWE DEI GRA REX LITOWIE (“Mindaugas, by the grace of God, King of Lithuania”. ==Scholarship==