Origen was largely responsible for the collection of usage information regarding the texts that became the New Testament. The information used to create the late-4th-century Easter Letter, which declared accepted Christian writings, was probably based on the "Ecclesiastical History" of Eusebius of Caesarea, wherein he uses the information passed on to him by Origen to create both his list at HE 3:25 and Origen's list at HE 6:25. Eusebius got his information about what texts were then accepted and what were then disputed, by the third-century churches throughout the known world, a great deal of which Origen knew of firsthand from his extensive travels, from the library and writings of Origen.