 Complete the following phrase:  By the 11th century the ancient structure had sunk to at least 3 metres beneath the street level, with its doors and windows blocked, and served as a storage place for goods and water. During this century, an organisation of Amalfitan merchants settled in Jerusalem and acquired the south-west corner of the Hadrianic forum, where they established a pilgrim hospice, complete with a hospital and a church. The new church was erected above the ancient structure, which became its basement and dictated the tri-apsed layout of the entire church. This church was tended to by Benedictine monks. In 1099, Crusader knights injured during the 