When Joao III dies in 1557, the …

Years: 1540 - 1683

When Joao III dies in 1557, the only surviving heir to the throne is his three-year-old son, Sebastião, who takes over the government at the age of fourteen.

Sickly and poorly educated, Sebastião proves to be mentally unstable, and as he grows to young manhood he develops a fanatical obsession with launching a great crusade against the Muslims in North Africa, thus reviving the Moroccan policy of Afonso V.

In 1578, when he is twenty-four years old, Sebastião organizes an army of twenty-four thousand and assembles a large fleet that leaves Portugal on August 4 for Alcazarquivir.

Sebastião's army, poorly equipped and incompetently led, is defeated, and the king, presumed killed in battle, is never seen again.

A large number of the nobility are captured and held for ransom.

This defeat, the most disastrous in Portuguese military history, sweeps away the flower of the aristocratic leadership and drains the coffers of the treasury in order to pay ransoms.

Worse, it results in the death of a king who has no descendants, plunging Portugal into a period of confusion and intrigue over the succession.

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