mˈɑːɹɡɹət wʌz bˈɔːɹn ˌɔn fˈɪftiːn mˈɑːɹtʃ wˈʌn θˈaʊzənd tˈuːhˈʌndɹɪd sˈɛvənti fˈaɪv, æt wˈɪndsɚ kˈæsəl, ðə tˈɛnθ tʃˈaɪld ʌv kˈɪŋ ˈɛdwɚd aɪ ænd hɪz kˈʌzən ᵻlˈiːnɚɹ ʌv kˈæstaɪl.
Margaret was born on 15 March 1275, at Windsor Castle, the tenth child of King Edward I and his cousin Eleanor of Castile.