The Battle of Yamama was fought in 632 AD against the false prophet Musaylimah and his followers.

Hazrat Umar (RA) established the Islamic calendar in the year 17 AH, marking the Hijrah as the starting point.

Dhul-Nurayn translates to 'The Possessor of Two Lights,' referring to his marriages to Ruqayyah and Umm Kulthum (RA).

Hazrat Ali (RA) moved the administrative capital of the Caliphate to Kufa in modern-day Iraq.

Although the standardized script was distributed under Hazrat Usman (RA), the initial compilation into one book was ordered by Hazrat Abu Bakr (RA) after the Battle of Yamama.

Hazrat Umar (RA) introduced the institution of Shurta to serve as the police force to ensure law and order.

The Battle of the Camel occurred in 36 AH between the forces of Hazrat Ali (RA) and those led by Hazrat Aisha (RA), Hazrat Talha (RA), and Hazrat Zubayr (RA).

Hazrat Usman (RA) was martyred in the year 35 AH during a period of civil unrest.

Hazrat Umar (RA) introduced the 'Diwan' system to maintain the records of the army and distribute salaries.

Hazrat Umar (RA) appointed Hazrat Abdur Rahman bin Awf (RA) to lead the consultative committee (Shura) to elect the third Caliph.

Hazrat Khalid bin Walid (RA) was the primary military commander who led Islamic forces to a decisive victory against the Byzantines at Yarmouk.

Hazrat Umar (RA) personally traveled to Jerusalem to accept the surrender of the city, marking a significant milestone in early Islamic expansion.

Sa'd ibn Abi Waqqas (RA) was the commander at the Battle of Qadisiyyah and served as the governor of Kufa, overseeing the conquest of the Sassanid Empire.

The Prophet (PBUH) titled him 'As-Siddiq' (The Truthful) after he immediately affirmed the authenticity of the Night Journey (Isra and Mi'raj) when others doubted it.

Hazrat Umar (RA) institutionalized the 'Bayt al-Mal' to organize public revenue, state expenditure, and the welfare stipends for the citizens.

The Battle of Siffin was fought between the armies of Hazrat Ali (RA) and Mu'awiya ibn Abi Sufyan (RA) in 657 AD over the issue of the retribution for Hazrat Usman's (RA) assassination.

The 'Diwan' was a register-based administrative system designed to manage military records, soldiers' pay, and pensions for the citizens of the Islamic state.

Hazrat Usman (RA) commissioned a committee led by Zayd ibn Thabit (RA) to compile the definitive text of the Holy Quran, known as the 'Uthmani Mushaf'.

The Caliphate of the Khulafa-e-Rashideen lasted approximately 30 years, from 632 AD to 661 AD.