Glast son of Cunnedda. Nothing to do with woad.

South facing well with a thorn tree growing beside it, common pagan sacred site. The chalice well symbol is a visica piscus bisected by a sword, another obvious modernisation of a pagan symbol for a sacred place. Or maybe that's just the trunk of the thorn tree

A lot of jewellery ranges include chalice well symbols, proven very popular. If I win the lottery I'd spend money improving the wells around Edinburgh, I think.