January 5, 1531: Pope Clement VII forbids King Henry VIII from remarrying. Pope Clement VII sends a letter to King Henry VIII of England forbidding him to remarry under penalty of excommunication. Henry, who was looking for a way out of his marriage to his first wife, Catherine of Aragon, ignored the pope’s warning. He went on to marry Anne Boleyn (and four subsequent wives), leading to his excommunication and one of the most significant schisms in the history of Christianity.
January 5, 1968: Prague Spring begins in Czechoslovakia. Antonin Novotny, the Stalinist ruler of Czechoslovakia, is succeeded as first secretary by Alexander Dubcek, a Slovak who supports liberal reforms. In the first few months of his rule, Dubcek introduced a series of far-reaching political and economic reforms, including increased freedom of speech and the rehabilitation of political dissidents.
January 5, 1976: Pol Pot renames Cambodia. Khmer Rouge leader Pol Pot announces a new constitution changing the name of Cambodia to Kampuchea and legalizing its Communist government. During the next three years his brutal regime was responsible for the deaths of an estimated 1 to 2 million Cambodians.