Chigi, a family of Roman prelates and princes, who are hereditary marshals of the conclave. They originally came from Siena, where the Chigi-Zondadavi branch still exists. Fabio (1599-1667) became pope under the name of Alexander VII. and vastly increased the wealth and intluenco of his relatives, the magnificent Chigi palace and the extensive Chigi library in Rome still perpetuating the memory of the family. They subsequently added the family name Albani of Pope Clement XL to their own. The present head of the Chigi-Albani princes is Don Sigismondo, born Aug. 24, 1798. Flavio, a brother of Prince Sigismondo, and the present papal nuncio in Paris, born in 1810, was in 1848 an officer of the pope's body guard of nobles, and afterward took holy orders. On being appointed papal representative at the coronation of Alexander II. of Russia (Sept. 7, 1856), he received the title of archbishop of Mira in partibus. He was subsequently nuncio in Munich, and on Jan. 23, 1862, he was accredited in the same capacity in Paris.