António Guterres has been serving as Secretary‑General of the United Nations (he took office in 2017), matching the answer provided.

Omar Khayyam is best known as a Persian poet, celebrated for his quatrains (rubaiyat).

Omar Khayyam was a Persian poet, renowned for his quatrains (rubaiyat) and poetic works.

Salman al-Farsi, who was familiar with Persian military tactics, proposed the digging of a trench (Khandaq) to protect the city of Madina from the invading confederate forces. This innovative defensive strategy proved highly effective, as the trench prevented the enemy cavalry from advancing. The successful defense of the city during this siege is a landmark event in the early history of the Islamic state.

In 331 B.C., the Battle of Gaugamela took place, where the Macedonian Greek forces led by Alexander the Great decisively defeated the Achaemenid Persian Empire under Darius III. This victory effectively ended Persian dominance in the region and allowed Alexander to expand his empire into Asia. This event is a landmark in ancient history, marking the transition from Persian to Hellenistic influence in the Near East.

The Taj Mahal, a world-renowned mausoleum built by the Mughal Emperor Shah Jahan, is located in the city of Agra. Agra is situated in the state of Uttar Pradesh, India. It is considered one of the finest examples of Mughal architecture, blending elements from Islamic, Persian, and Indian styles. It remains a major cultural landmark and a symbol of India's rich historical heritage.

Shah Waliullah Dehlawi was a renowned 18th-century Islamic scholar who sought to revive Islamic learning in India. His translation of the Quran into Persian was a landmark achievement, intended to make the divine message accessible to the Persian-speaking Muslim population of the region during that era.

Maulana Jalal-ud-Din Rumi was born in 1207 A.D. in the city of Balkh, which is located in present-day Afghanistan. Although he spent the majority of his life in Konya, Turkey, where he composed his famous works like the Masnavi, his early life and formative years were rooted in the Persian-speaking region of Balkh. He is celebrated globally for his profound contributions to Sufi literature and philosophy.

Cyrus the Great, the founder of the Achaemenid Empire, established the first Persian Empire in 549 B.C. He is renowned for his military conquests, which united the Median and Persian kingdoms, and for his policy of religious and cultural tolerance toward the diverse peoples he conquered, which helped stabilize his vast empire.

Shah Waliullah of Delhi was a prominent 18th-century Islamic scholar who translated the Quran into Persian to make its teachings accessible to the Persian-speaking population of the Indian subcontinent. His work, 'Fateh al-Rahman fi Tarjumat al-Quran', remains a significant contribution to Islamic scholarship in the region, reflecting his efforts to revitalize Islamic thought and practice during a period of political decline.