Razgrad Province is a region in northeastern Bulgaria. The district is geographically part of the Ludogorie region. Its main city is Razgrad, and it also includes the municipalities Isperih, Kubrat, Loznitsa, Samuil, Tsar Kaloyan, and Zavet. The population of Razgrad Province is ethnically mixed, with no ethnic group constituting an absolute majority according to the 2001 census. The biggest river flowing through the area is Beli Lom. Some of Razgrad's landmarks include the Varosha architectural complex from the 19th century, the ethnographic museum and several other museums, the characteristic clock tower in the centre built in 1864, the St Nicholas Church from 1860, the Momina cheshma sculpture, the Mausoleum Ossuary of the Liberators (1879-1880) and the Ibrahim Pasha Mosque from 1530. The mosque is said to be the third largest one in the Balkans,excluding Istanbul - its reconstruction has still not been completed, having begun in Communist times. In 251, the town was the site of the Battle of Abrittus, during which the Goths defeated a Roman army under the emperors Trajan Decius and Herennius Etruscus. The battle is notable for being the first occasion of a Roman emperor being killed in a battle with barbarians.