Answer
Tehran, the capital city of Iran, holds the distinction of being the birthplace of ʻAbdu'l-Bahá. This pivotal figure, considered the exemplar of the Bahá'í faith, was born into an illustrious family that played a profound role in shaping the religious movement. ʻAbdu'l-Bahá's birth added an indelible chapter to Tehran's rich tapestry of history and cemented its significance in the annals of the Bahá'í narrative.