dubdobdee | wiki-illiam q6!

i. whose papal audience proved fatal?
ii. who is remembered for his petrol bomb?
iii. who introduced us to an uncle and three sisters?
iv. who, during 14 years of generous subsidies, never met his benefactor?
v. which monarch outscored his English counterpart in his marital arrangements?
vi. whose complicity in the murder of his lover’s spouse insured the imperatricial succession?
vii. which spitefully insulted cuckold was fatally wounded by his brother-in-law?
viii. whose predictions were acknowledged in the naming of number 101?
ix. who shared the Prix Galabert with Glenn?
x. who investigated canine salivation?

the rules as they have evolved:
a: give nice full answers and anecdotes where possible!
b: say if googled or not, and leave a bit of a while for people to answer non-googlingly
c: you're obviously allowed to look ahead at future questions as (first) this was published in a national newspaper and i can't stop you and (second) i can't stop ME either, and have done exactly this

ii is molotov for his cocktail, iii is chekhov for his play three sisters, viii is mendeleyev maybe for his periodic table, x is pavlov obv so theme = end in v