The Battle of Khaybar occurred in 628 AD (7 AH). It was a significant military engagement between the Muslims of Madina and the Jewish tribes residing in the oasis of Khaybar. The victory at Khaybar was a strategic success for the early Islamic state, securing the northern borders and neutralizing a major source of opposition. This event is well-documented in Islamic historical records as a pivotal moment in the consolidation of power in the Arabian Peninsula.

The Great Wall of China (1) has origins dating back to the 7th century BC. Angkor Wat (4) was built in the 12th century. The Leaning Tower of Pisa (3) construction began in 1173 and continued through the 14th century. The Taj Mahal (2) was commissioned by Shah Jahan in 1632. Thus, the sequence 1, 4, 3, 2 is historically accurate.

Abu Raihan Al-Biruni was a renowned scholar and polymath who lived during the 11th century. He was a prominent figure in the court of Sultan Mahmud of Ghazni. His most famous work, 'Kitab al-Hind' (History of India), provides a detailed and objective account of Indian culture, science, and philosophy, reflecting his deep intellectual engagement with the region.

Abu Rayhan al-Biruni was a polymath and scholar who traveled to the Indian subcontinent during the early 11th century. His seminal work, 'Kitab al-Hind' (The Book of India), provides an objective and detailed analysis of Indian culture, philosophy, science, and social customs, making him one of the most important observers of medieval Indian history.

Abu Rayhan al-Biruni was a polymath who traveled to India in the early 11th century alongside Sultan Mahmud of Ghazni. During his time in the region, he studied Indian culture, philosophy, and science, eventually documenting his findings in his famous work, 'Kitab al-Hind'. His observations remain one of the most important historical sources for understanding the social and intellectual landscape of India during that period.

The Battle of Haldighati took place in 1576 between the forces of Maharana Pratap of Mewar and the Mughal army, which was commanded by Man Singh I. The Mughal army represented the interests of Emperor Akbar, who sought to expand his control over the Rajput kingdoms. The battle resulted in a tactical victory for the Mughal forces.

Abul-Fazl ibn Mubarak was a prominent court historian and one of the 'Navaratnas' (nine gems) in the court of Emperor Akbar. He is best known for writing the 'Akbarnama', the official chronicle of Akbar's reign, and the 'Ain-i-Akbari', which provides a detailed administrative and statistical account of the Mughal Empire under Akbar.

Harun al-Rashid was the fifth Abbasid Caliph and is widely considered one of the most influential rulers in Islamic history. His reign is synonymous with the Islamic Golden Age, characterized by immense cultural, scientific, and economic prosperity, and he is famously immortalized in the literary collection 'One Thousand and One Nights'.

The word 'Kremlin' is derived from the Russian language and specifically refers to a fortified complex or citadel found within a historical Russian city. The most famous example is the Moscow Kremlin, which serves as the administrative and political center of the Russian government. Historically, these structures were built to protect the city's leadership and key institutions from external threats.

The Representation of the People Act 1918 was a landmark piece of legislation in the United Kingdom. It granted the right to vote to women over the age of 30 who met specific property qualifications, as well as to all men over the age of 21. This was the first time women were permitted to vote in British parliamentary elections, marking a significant milestone in the history of suffrage and democratic reform.