Once in Royal David's City is a Christmas carol originally written as a poem by Cecil Frances Alexander. The carol was first published in 1848 in her hymnbook Hymns for Little Children. A year later, the English organist Henry John Gauntlett discovered the poem and set it to music.
Mae'r testun uchod ar gael o dan drwydded y CC BY-SA 3.0. Mae'n defnyddio deunydd o erthygl Wicipedia "Once in Royal David's City".