The "boyars", members of the landed nobility, formed the most important social group in the principality. The vast majority of the population was formed by peasants who were called several names, such as "vecini" ("neighbors") or "rumâni" ("Romanians"), in medieval documents. In this period, animals, especially sheep, remained the main item of export, but from the Wallachian Plain great quantities of grain were transported to the Mediterranean area. The basis of the peasants' diet was formed by millet eaten as porridge, while the "boyars" also used wheat.