Possible Clues:

• Patron saint of farmers
• Saint -- of Seville, Spanish archbishop and scholar
• Canonised Archbishop of Seville, regarded as the last of the Fathers of the Church
• Spanish encyclopedist St. __ of Seville
• Sevillano producer of etymologies
• Sarah, gift of Isis, and a fantastic read
• ___ the Laborer, patron saint of farmers
• Saint of Seville; so I ride (anag.)
• Ancient Spanish historian Saint __ of Seville
• Boy's name (aka Issy)