A group of First Communion children led the way strewing petals on the ground followed by priests and altar boys, with Fr Simon Davies carrying the Blessed Sacrament.
One Benediction took place in the cathedral garden and a second one back in front of the altar inside the cathedral.
Around a dozen children took their first Holy Communion during the Mass and they are among around 78 who will do so between Pentecost and the middle of July.
In his homily, Fr Simon said: “After the Mass today, we will process with the consecrated Sacred Eucharistic Host. As we walk behind Christ, we manifest our desire for him to truly lead us. We cannot see the road ahead but we must trust him always that he is leading us properly, as our shepherd and our king.
“The mediaevals who developed this festival and its words and symbols drew on the things that we see and do in ritual to reveal the reality of what is given to us.”