Who loved animals and believed that everyone was his brother and sister during middle ages?

St. Francis of Assisi, a prominent figure in the Middle Ages, is renowned for his deep love of animals and nature. He believed in the interconnectedness of all creation, often referring to animals as his brothers and sisters. His profound sense of compassion extended to all living beings, reflecting his belief in universal brotherhood. This philosophy is a cornerstone of his legacy and the Franciscan Order he founded.