Misc: [General knowledge] how many graces were there in greek mythology?

Questions

In 553 2nd Council of ---------- (5th ecumenical council) opens.?

In 1867 Battle of---------- ; Mexicans defeat Maximilian's forces (Cinco de Mayo).?

In 1891 Carnegie Hall opens in NYC with ---------- as guest conductor.?

In 1908 Rex ---------- England, actor (My Fair Lady, Cleopatra), born.?

In 1912 ---------- modern Olympic games opens in Stockholm.?