After the death of Prophet Mohammad (PBUH), people swore allegiance to -------------.

The Prophet Mohammad (PBUH) assigned Al-Ala’a ibn Al-Hadrami to Al-Monzir ibn Sawa Al-Tamimi the ruler of ------------, to embrace Islam.

Prophet Mohammad (PBUH) resolved the Treaty of ------------ with the Meccans in 6 A.H.

The Prophet Mohammad (PBUH) found a powerful Islamic state in ---------------------.

In the ninth Hijri year, the Prophet Mohammad (PBUH) delegated Amir ibn al – Aas and Aba Zaid al-Ansari to carry the message to the rulers of ------------.

Having embraced Islam, the rulers of Oman were helpful in defeating the -------------- influence.

Name the two caliphates, flourished in areas that adopted Islam voluntarily.

According to Arab and Islamic sources, Qataris were skilful -----------.

Osman bin Abi Aas continued his conquests in Persia and opened Persepolis in ................