Re: King and Queen

 Ar an ceathrú lá de mí Meitheamh, scríobh Ross Clark:

 > [...] Monarchs, then, can have spouses who do not reign. Could two people be
 > co-regnant? Wiliam III and Mary II, apparently, were co-monarchs
 > (1689-1694). I can't remember how that was worked out, though we heard about
 > it in high school. Or how William got to be "William III and II", as I just
 > read somewhere.

Los Reyes Católicos (Ferdinand and Isabella of Spain) were, fairly famously,
this.

--
‘As I sat looking up at the Guinness ad, I could never figure out /
How your man stayed up on the surfboard after fourteen pints of stout’
(C. Moore)