Ignatius was a Delaware politician, jurist and historian who served as an Associate Justice of the Court of Errors and Appeals from 1886 to 1897 and as the Associate Justice at large of the Delaware Supreme Court from 1897 to 1909.

A Democrat, Ignatius Grubb was appointed clerk of the Delaware Assembly in 1867, Deputy Attorney General in 1869 and Wilmington City solicitor in 1871. Three years later, he was John P. Cochran's campaign manager and was appointed Secretary of State after Cochran was elected Governor. During the Cochran administration, New Jersey and Delaware disputed fishing rights in the Delaware River south of the state's boarder with Pennsylvania. At Grubb's suggestion, the controversy was referred to the Supreme Court, but the issue was not finally settled until 1935.

He is best remembered as the champion for legislative reapportionment in Delaware in the 1880s and 90s and as the author of a 1896 history of the Delaware judiciary.

Ignatius was a Delaware politician, jurist and historian who served as an Associate Justice of the Court of Errors and Appeals from 1886 to 1897 and as the Associate Justice at large of the Delaware Supreme Court from 1897 to 1909.

A Democrat, Ignatius Grubb was appointed clerk of the Delaware Assembly in 1867, Deputy Attorney General in 1869 and Wilmington City solicitor in 1871. Three years later, he was John P. Cochran's campaign manager and was appointed Secretary of State after Cochran was elected Governor. During the Cochran administration, New Jersey and Delaware disputed fishing rights in the Delaware River south of the state's boarder with Pennsylvania. At Grubb's suggestion, the controversy was referred to the Supreme Court, but the issue was not finally settled until 1935.

He is best remembered as the champion for legislative reapportionment in Delaware in the 1880s and 90s and as the author of a 1896 history of the Delaware judiciary.