[2] On 20 January 1933, the new diocese of Cagayan de Oro was created by Pope Pius XI through the Papal bull "Ad maius religionis".

[1] On 29 June 1951, Pope Pius XII, through the Papal bull "Quo Phillipina Republica", elevated the Diocese of Cagayan de Oro to an archdiocese and appointed Hayes as the first Archbishop.

In 1928, Hayes founded the San Agustin Parochial School, the predecessor of the present Lourdes College in Cagayan de Oro.

[9][8] In 1956, in order to respond to the growing number of priests in the diocese, Hayes founded the San Jose de Mindanao Seminary.

[10] In recognition of Archbishop Hayes' role in the history of Cagayan de Oro, the road traversing from the north wing of the Cagayan de Oro City Hall to the St. John Vianney Theological Seminary was named after him.