Reformer enthralled foremost in Italy - Stradivarius? (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Reformer enthralled foremost in Italy – Stradivarius? I <taly> (“foremost in” means first letter only) in LUTHER (=reformer, i.e. German theologian Martin Luther); a luthier is a maker of lutes, guitars and other stringed instruments, hence such as the Italian violin-maker Stradivarius