father death_date title article_title name reign
otak 1225 khan of volga bulgaria emir of the bulgars ghabdula chelbir
 ghabdula chelbir 1178 - 1225
ghabdula chelbir

ghabdula chelbir -lrb- or only chelbir -rrb- was ruler of volga bulgaria from 1178 to 1225 .
he was the son of otak .
during the reign of chelbir , volga bulgaria strengthened its economy and military .
over his reign , the state extended from the caspian sea to the arctic ocean and the capital moved from bolghar to bilär .
