Votive Mass for the First Saturday of the month.  Proper on pages 1091 (after Trinity Sunday until Advent), 1082.  Preface of the Blessed Virgin Mary on page 884.

Dominic Guzman, born in Spain, opposed the errors of the Albigenses.  He founded the Order of the Friars Preachers, contributing to devotion to the Rosary, saving the Western Church from heresy and anarchy.  He died A.D. 1221.
Proper on pages 1407, 1037, 1033. Common Preface on page 886.