As was standard practice, as revealed by inscriptions, the Romans matched their deities with local Silurian ones, and the local deity Ocelus was identified with Mars, the Roman god of war. Caerwent seems to have continued in use in the post-Roman period as a religious centre and the territory of the Silures later became the 5th century Welsh Kingdoms of Gwent, Brycheiniog and Gwynllŵg. Some theories concerning King Arthur make him a leader in this area. There is evidence of cultural continuity throughout the Roman period, from the Silures to the kingdom of Gwent in particular, as shown by leaders of Gwent using the name "Caradoc" in remembrance of the British hero Caratacus. Reference is occasionally made to this period of Celtic history by the use of terms such as "Silurian". The poet Henry Vaughan called himself a "Silurist", by virtue of his roots in South Wales. The geological period Silurian was first described by Roderick Murchison in rocks located in the original lands of the Silures, hence the name. That period postdates the Cambrian and Ordovician periods, whose names are also derived from ancient Wales.