St Demetrius' Cathedral was built on the orders of Vsevolod the Big Nest between 1194 and 1197 to serve as his court's church. It is dedicated to the martyr St Demetrius of Thessaloniki (Saloniki), whose name Vsevolod took when he was christened. In form it is the standard white-stone four-pillar single-dome structure, but stands out due to its stunning stone carvings of patterns, saints and real and mythical beasts. Inside some fragments of 12th century frescos remain. In 1992 the cathedral was included on the UNESCO World Heritage List as part of the White-Stone Monuments of Vladimir and Suzdal. The cathedral is now run as a museum and owned by the Vladimir-Suzdal Museum Reserve.