In the centuries following, many abbeys and priories were built in Yorkshire. Norman landowners increase their revenues and established new towns such as Barnsley, Doncaster, Hull, Leeds, Scarborough and Sheffield, among others. Of towns founded before the conquest, only Bridlington, Pocklington, and York continued at a prominent level. The population of Yorkshire boomed until hit by the Great Famine in the years between 1315 and 1322.