As I understand it there were royal and non-royal caliphs, just as there
are royal and non-royal governors. Caliph has the advantages that it can be
extrapolated, giving along with Bishop+Knight=Cardinal names for all Bishop
compounds with all coprime oblique leapers. Thus Zebra gives Zerdinal,
Giraffe Girdinal, Antelope Nardinal, Zemel Zeliph, Satyr Sardinal, Gimel
Giliph, Rector Rerdinal... If anyone can think of a better alternative that
can be extrapolated as obviously I'm eager to know it. Likewise for the
Rook compounds Canvasser gives Rook+Zemel=Zenvasser,
rook+Gimel=Ginvasser...
