300 villages and covering an area of from 50 to 70 square miles.[306] Excepting the royal lands, the largest estates, whether in Great or in Little Poland, were those of the bishops or monastic institutions. They completely overshadowed the estates of the Polish nobility. Two-thirds of the landed estates of the nobility of Great Poland consisted of one village each. Even the magnates of Great Poland had comparatively small possessions. Large estates were exceptional in Great Poland, and they were either royal or ecclesiastical.[307] In Mazovia the only large land owners were the king and the clergy. There was absolutely no magnate in the entire duchy equal in wealth to the bishop of Płock. In fact, outside of the clergy, there were no magnates in Mazovia.[308] Nor was there a magnate in Little Poland equal as a landlord to the bishop of Cracow. The wealthiest of them, Prince Constantine Ostrogski, could boast of only 80 villages, an estate one-fourth the size of that of the bishop of Cracow. The next wealthiest aristocratic family, the Jordans, were lords of only 33 villages, the Zborowskis, 30, the Komorowskis, 29, the Szafraniec family, 22, and the rest had 10 to 20 villages each. To equal the landed property of the bishop of Cracow, it would have been necessary to combine the estates of ten wealthiest and foremost aristocratic families of Little Poland, whose combined properties numbered 292 villages, about the number of those of the bishop.[309] Viewed in the light of their landed property, the Polish bishops were not only ecclesiastical, but also secular princes. In fact, a number of them bore princely titles. The archbishop of Gniezno and primate of Poland was prince of Łowicz; the bishop of Warmia was at the same time prince of Warmia; the bishop of Cracow was prince of the Principality of Siewiersk; the bishop of Płock was prince of Pułtusk; and the prebendary of Płock was prince of Wieluń.[310]