The 5th state to be admitted to the Union, 9 January 1788.
Proof that Jesuit missionaries labored early among the Indians of Connecticut exists in the laws passed by the colony, 1648, expelling Jesuits and threatening them with hanging if they returned.
In 1650-1651, however, Father Gabriel Druillettes, S.J., visited New Haven as an envoy from Canada to establish friendly trade relations with government officials.
In spite of the arrival in Connecticut, 1755, of 400 exiled Acadians, and an early influx of Irish immigrants, many of whom served in the Revolution, no ministry of priests was allowed within the state until the Constitution of 1818 established religious freedom.
Occasionally missionary priests had visited the French troops of Rochambeau's army, or settlers of French descent.
In the early 19th century there were visitations from Bishop Jean Cheverus of Boston, and his successor Bishop Benedict Fenwick.
Finally, 1828, a resident priest, Revend Bernard O'Cavanaugh, was appointed to Hartford, an upper room serving as the first chapel.
By 1834 there were churches in Hartford and New Haven.
The Diocese of Hartford comprises the state.
Catholic influence on place-names of the state is limited to one example
Ecclessiastically the state an archdiocese,
and two dioceses,
patron saints index
New Catholic Dictionary