The great city of Liverpool began as a tidal pool next to the Mersey. It was probably called the lifer pol meaning muddy pool. There may have been a hamlet at Liverpool before the town was founded in the 13th century. It is not mentioned in the Domesday Book (1086) but it may have been to small to merit a mention of its own.
King John founded the port of Liverpool in 1207. The English had recently conquered Ireland and John needed another port to send men and supplies across the Irish Sea. John started a weekly market by the pool. In those days there were very few shops so if you wanted to buy or sell goods you had to go to a market. Once a market was up and running at Liverpool craftsmen and tradesmen would come to live in the area. www.localhistories.org/liverpool