 Furthermore, a succession of warlords – many of them claiming the title King of Dublin – made Dublin their principal power-base, and from there launched a series of military campaigns against enemies in Ireland, Britain and further afield.The most likely possibility is that the "longphort" was established on the gravel ridge overlooking the Black Pool – the most easily defended location in Dublin – and that its remains were subsequently buried or obliterated by the later 10th century settlement of Dyflinn, which was built in the same location (not to mention Dublin Castle, which presently occupies the site).The discovery of what are thought to be late 9th-century earthen banks in Ross Road and Werburgh Street (immediately west of Dublin Castle) lends some support to this theory.