dubdobdee | KWQ q.3

3.
i. who ‘discovered’ Vortigern?
ii. which Old Borstalian was unmasked by Oberhuber?
iii. which epistle, allegedly from Grigori, helped Stanley to defeat Ramsay?
iv. who created documents covering an 11-year period, supposedly found in a hayloft in the DDR?
v. who produced a group of physicians to prove his innocence, but laid himself open to alternative charges?
vi. who was able, through his own work, to convince experts that the painter Martini was also a sculptor?
vii. which self-styled Japanese heathen described an island where broiled serpents were a favourite dish?
viii. in what was the mandible of pygmaeus equipped with the dentition of troglodytes?
ix. who palmed off depictions of a Brighton suburb, but later owned up?
x. who provided Lübeck with an anachronistic fowl?

rules:
a: give nice full answers and anecdotes!
b: say if googled or not
c: you're obviously allowed to look ahead and 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 just this

*i know the theme i think, and also iii., iv., and viii. (w/o googlin yet)