Alexander (August 1, 1893 – October 25, 1920) is King of Greece from June 11, 1917 until his death three years later, at the age of twenty-seven, from the effects of a monkey bite.

The second son of King Constantine I, Alexander was born in the summer palace of Tatoi on the outskirts of Athens.

He succeeds his father in 1917, during the First World War, after the Entente Powers and the followers of Eleftherios Venizelos push Constantine I, and his eldest son Crown Prince George, into exile.

Having no real political experience, the new king ius stripped of his powers by the Venizelists and effectively imprisoned in his own palace.

Venizelos, as prime minister, is the effective ruler with the support of the Entente.

Though reduced to the status of a puppet king, Alexander supports Greek troops during their war against the Ottoman Empire and Bulgaria.

Under his reign, the territorial extent of Greece considerably increases, following the victory of the Entente and their Allies in the First World War and the early stages of the Greco-Turkish War of 1919–1922.

Alexander controversially marries the commoner Aspasia Manos in 1919, provoking a major scandal that forces the couple to leave Greece for several months.

Soon after returning to Greece with his wife, Alexander is bitten by a domestic Barbary macaque and dies of sepsis.

The sudden death of the sovereign leads to questions over the monarchy's survival and contributes to the fall of the Venizelist regime.

After a general election and a referendum, Constantine I is restored to the throne.