A service at St Peter's Roman Catholic church in Roath, Cardiff, marked the building as a holy place of worship for the Ethiopian Orthodox Church.
The Metmiqe Melekot Kidus Yohannes church was set up a year ago for the capital's growing number of Ethiopians.
Priest Malake Fion Habte Marian said people from the wider community were welcome to join in the celebrations.
Around 100 people took part in the celebrations.
The service was conducted in Ahmaric, Ge'ez and English and as part of the service the priest dedicated a special prayer blessing Wales and the church on its first birthday.
Malake Fion Habte Marian, an angel of Zion, said: "We are glad we can establish a church in Wales.
"We welcome people from the wider community to come and celebrate with us," he said.
The service was to be followed by a reception where traditional Ethiopian food will be served.
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SIC: BBC