Around the beginning of the 1630s the first synagogues with nine-field vaulting were constructed. They allowed for much greater halls than hitherto and were also called "nine-bay synagogues". The Great Suburb Synagogue in Lviv and the synagogue in Ostroh were erected virtually at the same time (1625 and 1627). In these halls the vaulting rested on four tall pillars and on corresponding wall pilasters. The columns and the pilasters were situated in equal spacing and dividing the roof-area into nine equal fields. In these synagogues the bimah was a free-standing podium or a bower situated within the central field between the pillars.