Mater Dei High School is a private, Catholic, co-educational secondary school in Santa Ana, California in the Los Angeles Metropolitan Area. It is located in the Roman Catholic Diocese of Orange. With an enrollment of 2,100 students (Fall 2013) Mater Dei High School is one of the largest Catholic high schools in the United States. Mater Dei High School offers a comprehensive academic program in college prep, honors and Advanced Placement courses. Mater Dei High School is also known for its highly successful athletic programs, especially boys basketball, football, baseball and water polo. During the last decade, Mater Dei's Varsity sports teams have captured 28 CIF, 7 state and 2 national championships.HistoryMater Dei High School first opened in September 1950 with 111 students. During that first year, a statue of Mary, Mater Dei was presented to the school by the Young Ladies Institute. It was placed in the school's main courtyard, the Grotto, where it remains today.The first principal was Father Joseph L. Eyraud, who supervised a faculty of seven, including the Sisters of Charity of the Blessed Virgin Mary. The first graduating class chose the lion as the mascot, and it was decided that the school mascot should be called the "Monarchs" and wear red and gray.