The Iranian national flag is a tricolor horizontal flag featuring three equal bands of green, white, and red. The three colors are said to represent freedom, justice, and bravery. According to some accounts, this flag was designed by Mirza Hassan Shirazi, a leader in the Persian Constitutional Revolution of 1906.

Mirza Hassan Shirazi was a prominent religious leader who was influential in the movement to overthrow the authoritarian rule of Shah Mohammad Ali in Iran. He was a major advocate for the creation of a constitutional monarchy and the establishment of civil rights in Iran. He also sought to end the arbitrary rule of the Shah and to ensure the rule of law.

In 1906, Shirazi was part of a group of revolutionaries who sought to overthrow the Shah and take control of the government. During the revolution, he wrote a book titled “The Constitution of Iran”, which outlined the rights of citizens and the structure of a modern government for Iran. The book also included a proposed flag for the new republic, which was based on the French tricolor flag.

The flag that Shirazi proposed for the new republic was a horizontal tricolor consisting of equal bands of green, white, and red. Each color was said to represent a different concept; green stood for freedom, white for justice, and red for bravery. The flag was officially adopted as the flag of the new government on July 16, 1906.

Since then, the flag of Iran has become a symbol of national unity. It is displayed at all official events, and has been featured on the national currency since 1980. It is also the basis for the national anthem of Iran, which was written in 1965 and is sung at official ceremonies.

The flag of Iran has remained largely unchanged since it was first introduced by Mirza Hassan Shirazi in 1906. It has become a powerful symbol of national pride and identity, and continues to represent the principles of freedom, justice, and bravery that Shirazi sought to instill in the Iranian people.