He is the patron saint of Eucharistic congresses and Eucharistic associations.

He was largely instrumental in establishing Eucharistic Congresses; the first congress was held at Lille.

Congresses may both refer to National (varies by country) and International Eucharistic Congresses.

Created cardinal in 1886, he presided as papal legate over the Eucharistic Congresses of Jerusalem, Reims, and Lourdes.

He travelled to the Holy Land in 1964, to the Eucharistic Congresses in Bombay, India and Bogotá, Colombia.

He also encouraged Eucharistic Congresses, established the Confraternity of Christian Doctrine, and presided over several developments of St. Dunstan's University.

He served as papal legate to four more Eucharistic Congresses between 1907 and 1910, and in 1915 succeeded his brother Serafino as Dean of the College of Cardinals.

The spread of the earlier Eucharistic Congresses must be attributed above all to the fervour of those involved in different Eucharist-centred activities ('Eucharistic Works'), which in their turn benefited as well.

Bishop Doutreloux of Liège was then president of the Permanent Committee for the Organization of Eucharistic Congresses, the body which has charge of the details of these meetings.

Eucharistic Congresses are held generally every four years in various places around the world to promote an awareness of the central place of the Eucharist in the life and mission of the Catholic Church, to help improve the understanding and celebration of the liturgy and to draw attention to the social dimension of the Eucharist.