A Spanish Catholic bishop is under investigation by the Vatican over an allegation of sexual abuse dating back three decades, his diocese confirmed this week.

Bishop Rafael Zornoza Boy of the Diocese of Cádiz y Ceuta has temporarily stepped back from public duties while the Holy See examines claims that he abused a teenage boy in the 1990s, when he was a priest and rector of a diocesan seminary near Madrid.

The 76-year-old bishop, who has led the southern diocese since 2011, “firmly denies” the allegation, which he described through his office as “false.”