sentences:  The school originally opened in 1897 as Penarth Grammar School during the rapid Victorian expansion of the Penarth, Cogan, Llandough and Dinas Powys areas following the building of Cardiff and Penarth docks to handle the burgeoning South Wales coal trade.Between 1891 and 1901 the population of the town expanded from 12,000 to over 15,000 people and the need for a new school was paramount.The school was established for both boys and girls at a time when most British grammar schools were single sex establishments and few girls were even expected to complete a grammar school education.