History called him The Grim. But without him, the holy cities of Islam might have fallen.

In 1513, a Portuguese naval commander named Afonso de Albuquerque sat down to write a letter to his king. In that letter was a plan so monstrous that it still makes the blood run cold five centuries later.

His intention: to sail warships into the Red Sea, attack Mecca and Medina, desecrate the tomb of the Prophet Muhammad (peace be upon him), and hold it hostage ? until every Muslim on earth surrendered Jerusalem.

This was not fantasy. This was official imperial policy. The letters still exist in the Portuguese national archives today.

And there was almost no one left to stop it.

The Mamluk Empire ? guardians of the holy cities ? had no navy capable of facing European cannons. The sea routes to Mecca were exposed. The trap was closing.

Then, thousands of kilometres away, a prince seized a throne.

Yavuz Sultan Selim: The Grim Saviour is the extraordinary true story of the ninth Ottoman Sultan ? a man history remembers as ruthless, grim, and feared ? and the eight years in which he reshaped the entire Muslim world.

In eight relentless years, Selim:

Crushed the Safavid Empire at the Battle of Chaldiran using military genius that changed warfare forever

Crossed the supposedly impassable Sinai Desert to defeat the Mamluks of Egypt

Became Caliph of the Muslims ? the first Ottoman Sultan to hold that title

Secured Mecca and Medina under Ottoman protection ? destroying Albuquerque's plan forever

Laid the foundation for what history now calls The Magnificent Century

But this book does not offer you a simple hero. Selim killed his own brothers. He deposed his own father. He ruled with an iron hand that made even his ministers tremble.

This is the story of a man who paid the heaviest price of kingship ? and what his sacrifice meant for the Islamic world.

He was grim. He was complicated. He may have been exactly what history needed.

The dust of his path still lies on the road to Mecca.