Just by-the-by. The first time I came across Postumus as a name was in 'I Claudius' by Robert Graves. Postumus (no 'h' in this case) was a cousin of Claudius and one of the few good guys in the book, so naturally he was banished following a false accusation of rape.

I now have a work colleague, from the Netherlands, named Richard Posthuma. So the name lives on.