Question: Widewuto, a legendary king of the pagan Prussians, was believed to have existed before which army launched crusade against the Prussian peoples?

The Lithuanian Crusade was a series of campaigns by the Teutonic Order and the Livonian Order, two crusading military orders, to convert the pagan Grand Duchy of Lithuania into Roman Catholicism.  The Livonian Order settled in Riga in 1202 and the Teutonic Order arrived to Culmerland in 1230s.  They first conquered other neighboring Baltic tribes – Curonians, Semigallians, Latgalians, Selonians, Old Prussians (see Livonian Crusade and Prussian Crusade).  The first raid against the Lithuanians and Samogitians was in 1208 and the Orders played a key role in Lithuanian politics, but they were not a direct and immediate threat until 1280s.  By that time the Grand Duchy of Lithuania was already an established state and could offer organized defense.  Thus for the next hundred years the Knights organized annual destructive "reise" (raids) into the Samogitian and Lithuanian lands but without great success: border regions in Samogitia and Suvalkija became sparsely inhabited wilderness, but the Order gained very little territory.  The Grand Duchy finally converted to Christianity in 1386, when Grand Duke Jogaila accepted baptism from Poland before his wedding to reigning Queen Jadwiga and coronation as King of Poland.  However, the baptism did not stop the crusade as the Order publicly challenged sincerity of the conversion at the Papal court.  Lithuania, together with its new powerful ally Poland, defeated the Order in the decisive Battle of Grunwald in 1410, which is often cited as the end of the Lithuanian Crusade.  The final peace was reached by the Treaty of Melno (1422). <SEP> Old Prussians or Baltic Prussians (Old Prussian: "Prūsai"; German: "Pruzzen" or "Prußen"; Latin: "Pruteni" ; Latvian: "Prūši" ; Lithuanian: "Prūsai" ; Polish: "Prusowie" ; Kashubian: "Prësowié" ) refers to the indigenous peoples from a cluster of Baltic tribes that inhabited the region of Prussia.  This region became the core of the later state of Prussia.  It was located on the south-eastern shore of the Baltic Sea between the Vistula Lagoon to the west and the Curonian Lagoon to the east.  The people spoke a language now known as Old Prussian and followed pagan Prussian mythology. <SEP>  They are known from writings of 16th-century chroniclers Erasmus Stella, Simon Grunau, and Lucas David.  Though the legend lacks historical credibility, it became popular with medieval historians. Widewuto (also "Viduutus", "Vidvutus", "Witowudi", "Waidewut") was a legendary king of the pagan Prussians who ruled along with his elder brother, the high priest Bruteno in the 6th century AD.  It is unclear whether the legend was authentically Prussian (i.e. recorded from Prussian mythology) or was created by Grunau (possibly inspired by Biblical Moses and Aaron), though Lithuanian researchers tend to support in its authenticity. <SEP>  It was closely related to other Baltic faiths, the Lithuanian and Latvian mythologies.  Its myths and legends did not survive as Prussians became Germanized and extinct in the early 18th century.  Fragmentary information on gods and rituals can be found in various medieval chronicles, but most of them are unreliable.  No sources document pagan religion before the forced Christianization in the 13th century.  Most of what is known about Prussian religion is obtained from dubious 16th-century sources ("Sudovian Book" and Simon Grunau). The Prussian mythology was a polytheistic religion of the Old Prussians, indigenous peoples of Prussia before the Prussian Crusade waged by the Teutonic Knights.