Misc: Which politician is commemorated at a museum in Llanystumdwy,Wales?

Questions

In 1945 Adolf Hitler and wife ---------- commit suicide. ?

In 1955 Element ---------- announced - element 101. ?

In 1973 Nixon announces resignation of ---------- , Ehrlichman, et al. ?

In 1980 Terrorists seize ---------- Embassy in London. ?

In 1640 Portugal regains independence after 60 years of ---------- rule. ?