This phallic erection is:
The Pillar of Eliseg, originally a tall stone cross, is still a striking landmark. Now only part of a round shaft survives set within its original base. Almost invisible to today's visitor, the Pillar once bore a long Latin inscription saying that the cross was raised by Concenn, ruler of the kingdom of Powys, who died in AD 854, in memory of his great-grandfather, Eliseg who had driven Anglo-Saxon invaders out of the area. The Pillar stands on a mound of unknown date and function. By the late seventeenth century the Pillar was no longer standing, but the damaged inscription was recorded by the famous Welsh antiquary Edward Lhuyd. The mound was dug into in 1773 by the local land-owner Thomas Lloyd and is reported to have contained a stone cist with a skeleton.
More info available at
http://www.bangor.ac.uk/news/full-ori.php.en?Id=1360 
