Gabriel is an angel of heaven who appears to the prophet Daniel to interpret a vision (Daniel 8:15). He reveals to Daniel a prophecy found in Daniel 9:20. And in Luke 1:19, Gabriel announces the birth of John the Baptist to Zechariah. In Luke 1:26, God sends Gabriel to Nazareth in Galilee to a virgin engaged to a man whose name was Joseph, of the House of David.
The virgin's name was Mary. Gabriel told her that she had found favor with God, and that she would conceive and bear a son whom she was to give the name of Jesus, which means "Salvation." He also told Mary that her relative, Elizabeth, despite her old age, had also conceived a son (John the Baptist). Gabriel functions as a messenger. He announces the births of both John the Baptist and Jesus.
Next person in the Bible: Gad, son of Jacob/Israel