Margaret was born in 1242, the daughter of Bela IV, King of Hungary, and Maria Lascaris, daughter of the emperor of Constantinople. Before her birth her parents had vowed to dedicate their child to God if Hungary would be victorious over the invading Tartars. Their prayers were answered and so when four years old was placed in the Dominican monastery of Veszprim. At the age of twelve she moved to a new monastery built by her father near Buda and their made profession into the hands of Humbert of Romans. Margaret lived a life totally dedicated to Christ crucified and inspired her sisters by her asceticism, her works of mercy, her pursuit of peace, and her humble service. She had a special love for the Eucharist and the Passion of Christ and showed a special devotion to the Holy Spirit and Our Lady.
-taken from the 'Supplement to the Liturgty of the Hours for the Order of Preachers'