Iyoas I vs Mehmed IV Giray

Iyoas I became Emperor of Ethiopia at age 15 following the death of his father, Iyasu II. His reign was dominated by the rivalry between his mother, Empress Mentewab, and the powerful noble Ras Mikael Sehul.

A power struggle erupted between Empress Mentewab and Ras Mikael Sehul over control of the young emperor. Mikael Sehul, who had married Iyoas's aunt, gained dominance and effectively ruled the empire, sidelining the empress.

Ras Mikael Sehul ordered the assassination of Emperor Iyoas I after a dispute. This regicide shattered the traditional authority of the Solomonic dynasty and plunged Ethiopia into the Zemene Mesafint (Era of the Princes), a period of decentralized rule and civil war lasting until 1855.

Mehmed IV Giray led Crimean forces in the Battle of Ochakiv against the Polish-Lithuanian Commonwealth. The battle ended in a Crimean defeat, with heavy losses, but demonstrated the khanate's continued involvement in the Polish-Ottoman wars.

Mehmed IV Giray launched a major raid into the Polish-Lithuanian Commonwealth, capturing thousands of slaves and plundering towns. This raid was part of the Khmelnytsky Uprising, where Crimean Tatars allied with Cossacks against Poland.

Mehmed IV Giray was deposed by the Ottoman Sultan for failing to prevent Cossack raids on Ottoman territories. He was replaced by his brother, but later restored to the throne after a period of exile.