dubdobdee | wiki-illiam #104: q6

Q6: Who:
i: was Foolish?
ii: was Rodrigo de Borja y Borja?
iii: invested Henry Sinclair as Earl of Orkney?
iv: had a half-sister sired by his father's physician?
v: founded a Siamese school, which was later named in his honour?
vi: was born on the 34th annversary of the death of his great grandfather and the 17th of that of his great aunt?
vii: was the offspring of parents sharing the same grandmother?
viii: was the 36th and last in a line started in 1299?
ix: was blinded by his mother Irene?
x: was tripartite?

the rules as they have evolved:
a: nice full answers and anecdotes if poss
b: say if googled or no; leave time for non-googlers to play
c: obviously look ahead at future questions if you want
d: don't bring in confirming or dissenting answers from other fora until next set is up and running

spoilers: er er i think emperor constantine's mum was called irene and bullied him, and "all gaul is divided into three part -- all? no!" but i'm not sure either of these is right -- i feel the answers are mostly royal