Abu Bakr vs Ardashir I

Abu Bakr launched military campaigns against Arabian tribes that renounced Islam or refused to pay zakat after Muhammad's death. The wars, led by generals like Khalid ibn al-Walid, reestablished Muslim control over Arabia and consolidated the caliphate.

After the death of Muhammad, Abu Bakr was elected as the first caliph (successor) at Saqifah. His election unified the Muslim community, though it caused controversy among some supporters of Ali. He became the leader of the nascent Islamic state.

Abu Bakr ordered the compilation of the Quran into a single written manuscript after many memorizers died in the Ridda Wars. Zayd ibn Thabit collected verses from various sources, creating the first official codex, which later served as the basis for Uthman's standard text.

Abu Bakr died after a brief illness, having designated Umar as his successor. His caliphate lasted only two years but established the foundations of the Islamic state, including the expansion beyond Arabia and the preservation of the Quran.

Ardashir I defeated the Parthian king Artabanus IV at the Battle of Hormozdgan. This victory ended Parthian rule and allowed Ardashir to establish the Sassanid Empire, which would dominate Persia for four centuries.

Following his victory at Hormozdgan, Ardashir I systematically conquered the remaining Parthian territories, including Media, Armenia, and Mesopotamia. He established a centralized administration and a Zoroastrian state church.

After his victory, Ardashir I was crowned 'Shahanshah' (King of Kings) at Ctesiphon. He claimed descent from the Achaemenid dynasty, legitimizing his rule and reviving Persian imperial traditions.