Final answer:
Saint Isidore of Seville is known for compiling the 'Etymologiae', an important scholarly work that aimed to preserve the entirety of human knowledge at the time. He is a Doctor of the Church and the patron saint of the internet and computer users.
Step-by-step explanation:
Saint Isidore of Seville, not to be confused with Isidore of Miletus who was a co-architect of the Hagia Sophia in Constantinople, is renowned for his vast scholarly work, particularly the 'Etymologiae' or 'Origines'. This encyclopedia was one of the most influential books in the medieval world, aiming to preserve the entirety of human knowledge available at the time. As a scholar, theologian, and ecclesiastical leader, Saint Isidore played a critical role in the education and religious life of Seville and beyond. His contributions to Seville's intellectual and spiritual realm led to his designation as a Doctor of the Church posthumously, and he is venerated as the patron saint of the internet and computer users due to his desire to categorize and store knowledge.