 The siege of Nicaea marks also the high point of the Umayyad raids, as new threats and defeats on their far-flung frontiers decreased Umayyad strength elsewhere, while Byzantine power strengthened afterwards.Following the failure of the year-long assault by the Umayyad armies on the Byzantine capital Constantinople in 717–718, a short period of peace followed as the Umayyads licked their wounds, suppressed the rebellion of Yazid ibn al-Muhallab, and re-assessed their priorities.When warfare on the Arab–Byzantine frontier recommenced in 720, the strategic focus of the Caliphate had shifted away from outright conquest.