Sheikh Saeed bin Tahnun Al Nahyan was the ruler of Abu Dhabi, one of the Trucial States which today form the United Arab Emirates (UAE), from 1845 to 1855.
Ali bin Khalifa, the Bahraini representative in Qatar, made overtures towards Saeed requesting assistance, and again wrote to him on 18 May, 1851, stressing the need for immediate reinforcements as Faisal's forces were a mere two days away from Al Bidda.
Saeed, who maintained cordial relations with both the Bahraini rulers and the Qatari leadership, emerged as a key mediator in the ensuing diplomatic efforts.
His involvement was prompted by concerns shared with other rulers of the Trucial Coast, particularly the Sultan of Muscat and the Sheikh of Sharjah, regarding the potential threat posed by Faisal's prolonged presence in Qatar.
Working in conjunction with Ahmed bin Mohammad Sudairi, the chief of Al Ahsa, he successfully brokered a peace agreement by 25 July.
The terms of this accord included:[7] Saeed personally traveled to Bahrain to secure Mohammad bin Khalifa's ratification of the agreement.
The successful mediation led to Faisal's departure from Qatar on 26 July, 1851, the lifting of the Bahraini blockade of Qatif and Al Bidda, and the withdrawal of British naval forces from the area.