 Complete the following phrase:  During the 13th and 14th centuries, Rostov and Yaroslavl principalities continued to split up and weaken. They became easy targets for other, more powerful princes, most importantly the House of Moscow. In 1302 Ivan of Pereslavl bequeathed his principality to Daniel of Moscow. In 1328 Ivan I of Moscow bought out the Uglich principality. Starting with 1332, Muscovites began to acquire parts of the Rostov Principality little by little, completely subduing it by the middle of the 15th century. In 1380 soldiers of the Rostov and Yaroslavl principalities joined the allied army of Moscow prince Dmitry Donskoy in the 