In Moldavia, agriculture and animal raising remained the principal economic activities. Similarly to Wallachia, wooden plow remained the main agricultural tool throughout the Middle Ages. The constant clearing of land shows that finding new land was still preferred to crop rotation. The establishment of the principality enhanced the security of travel, thus Moldavia could also profit from the transit trade between Poland and the Black Sea ports. The first local coins were minted in 1377, under Peter I Muşat ("c." 1375–1391).