7 historical events, 1 notable births, and 1 notable deaths in 1621.
Battle of Fort Zhenjiang
Signed on 1621 were Valtelline was restored to the Bund and Protestants in the region were given religious freedoms
Military conflict in Spring 1621
1621 siege during the Huguenot rebellions
1621 military investment during the Huguenot rebellions
Battle of the Thirty Years'War, 1621
1621 naval battle in the Eighty Years' War