Ralph, Nobody is sure. I think the discovery by Romans of America and the presence of Romans in the building trades in the US is far too under-studied, and could be a great research project. Get on it... I'll do that. In the meantime, you can wait for me. Twy. Ralph -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: <http://listserv.icors.org/archives/bullamanka-pinheads.html>