The book "Philippine Islands, 1493-1803. Volume 01 of 55. 1493-1529. Studies of early navigators, description of the islands and their inhabitants, their history and religious missions of the Catholic Church, as described in modern books and manuscripts, showing..." — is a documentary source that immerses the reader in the rich history of the Philippine Islands from 1493 to 1803. The authors reveal a wide range of topics, from the history of exploration of the territory to the life of missionaries and the local population, and reflect this period in all its complexity. The correspondence, accounts, and testimonies presented in this book allow readers to gain a deeper understanding of the cultural, religious, and political context of the Philippine Islands during that period and explore how the area changed over the centuries.