Martyrdom of Ibrahim ibn Abdullah ibn al-Hasan al-Muthanna

On 25th of the Islamic month of Zil-Qa'dah in 145 AH Ibrahim ibn Abdullah ibn al-Hasan al-Muthanna, achieved martyrdom near Kufa in a battle with the forces of Mansour Dawaniqi, the 2nd self-styled caliph of the usurper Abbasid regime. He was a great grandson of Prophet Mohammad’s (SAWA) elder grandson and 2nd Infallible Heir, Imam Hasan Mujtaba (AS), while his grandmother, Fatema (SA) was the daughter of the Prophet's 3rd Infallible Heir, Imam Husain (AS) the Martyr of Karbala.
He had launched his uprising in Ramadhan in Basra in coordination with his brother Mohammad Nafs Zakiyya's uprising in the Hijaz, and within two months had liberated the whole of southern Iraq and Iran from the Abbasids, while Nafs Zakiyya liberated Arabia and Yemen, thus badly cornering Mansour in his capital Hira in central Iraq (when Baghdad was not yet built).
It is worth noting that years earlier during the repressive rule of the Godless Omayyads, the Prophet's clan, the Hasehmites, had held a grand assembly at Abwa where Abbas as-Saffah and Mansour Dawaniqi (the future usurpers of the caliphate) had sworn allegiance to Nafs Zakiyya as the caliph. But with the toppling of the Omayyads, the Abbasid brothers indulged in widespread propaganda to hijack the rule of the Muslim realm by breaking their promise to handover the caliphate to the Prophet's Ahl al-Bayt.
Imam Ja'far Sadeq (AS), as the 6th Infallible Heir of the Prophet, sensed the plot and stayed away from the political tussle and even spurned the offer of caliphate by burning the sealed envelope in this regard sent by a victorious commander of the anti-Omayyad uprising, since his right was God-given and beyond the power of politicians. Among the descendants of Imam Hasan (AS), however, Mohammad Nafs Zakiyya and Ibrahim aspired for political power and challenged the Abbasids for breaching their promise.
Thus, as a result of the uprising of these two brothers, when Mansour was on the verge of being defeated, news arrived of the martyrdom in Medina of Nafs Zakiyya. This emboldened the Abbasids and in the decisive battle near Kufa, an arrow pierced Ibrahim’s neck and this venerable descendent of the Prophet was immediately unhorsed and decapitated by the wretch, Hamid bin Qahtaba, who sent his head to Mansour's nephew Isa bin Musa. Mansour Dawaniqi, who in 148 martyred Imam Sadeq (AS) through poisoning, is notorious for his shedding of the blood of the Prophet's descendents, especially Imam Hasan's (AS) progeny.