As his nisba indicates, he was a military slave of the Sajid ruler of Adharbayjan, Yusuf ibn Abi'l-Saj.[1] After Yusuf died in 928, he was succeeded briefly as ruler by his nephew, and then by Wasif al-Shirvani in 929 as governor of Adharbayjan for the Abbasid Caliphate. He in turn was followed, likely in the same year, by Muflih. Muflih is first mentioned by Ibn al-Athir in office in 931, and held the post at least until 935, when the last coins struck in his name appear. After him the province was taken over by the KharijiDaysam ibn Ibrahim, likewise a former officer of Yusuf ibn Abi'l-Saj, in 937/8.[2][3]
In 931, the Byzantines were engaged in southern Armenia, aiding the ruler of Vaspurakan, Gagik I, who had rallied the local Armenian princes and allied himself with the Byzantines against the local Muslim emirates; the Christian forces raided the Kaysite emirate and razed Khliat and Berkri to the ground, before marching into Upper Mesopotamia and capturing Samosata. Learning of this, Muflih assembled a "large army" and himself invaded Armenia, defeating Gagik and his Byzantine allies in a battle that according to Ibn al-Athir cost 100,000 Armenians their lives.[1][2][5][6]
When Daysam took power in Adharbayjan, Muflih fled to Shirvan and sought refuge with the local autonomous ruler, Abu Tahir Yazid, but the latter handed him over to Daysam to avoid trouble.[7]