 Complete the following phrase:  In the north-west, Lithuania faced constant armed incursions from the Teutonic Knightsfounded after 1226 to fight and convert the pagan Baltic tribes of Prussians, Yotvingians and Lithuanians. In 1380, Jogaila concluded the secret Treaty of Dovydiškės, directed against Kęstutis. When Kęstutis discovered the plan, the 