Iziaslav, also spelled Izyaslav or Zaslav is one of the oldest cities in Volhynia. Situated on the Horyn River in western Ukraine, the city dat…Iziaslav, also spelled Izyaslav or Zaslav is one of the oldest cities in Volhynia. Situated on the Horyn River in western Ukraine, the city dates back to the 11th century. Iziaslav belongs to Shepetivka Raion of Khmelnytskyi Oblast. It hosts the administration of Iziaslav urban hromada, one of the hromadas of Ukraine. Population: 15,296.