Vizier who wrote a book used in training young officials?

You're likely thinking of Abu al-Hasan Ali ibn Abi Talib al-Mawardi, a renowned scholar and vizier who lived in the 11th century. He wrote a book called "The Ordinances of Government" ("al-Ahkam al-Sultaniya"), which became a standard text for training young officials in the Islamic world.

Here's why he's considered a crucial figure:

* Comprehensive Legal Treatise: "The Ordinances of Government" delved deeply into various aspects of governance, covering areas like public finance, law enforcement, administration of justice, and even the roles of different government officials.

* Influence on Islamic Law: His work had a lasting impact on Islamic law, particularly in the field of Islamic jurisprudence, which is still relevant today.

* Importance for Education: His book was used as a primary source for training future administrators and scholars. It shaped the education system and ensured the perpetuation of knowledge about governance.

While there are other prominent viziers who wrote influential works, al-Mawardi's "The Ordinances of Government" stands out as a classic text, crucial for understanding the development of governance in the Islamic world.