Sigeric the Serious
“According to the Anglo-Saxon Chronicle, Archbishop Sigeric of Canterbury went to Rome in 990, to fetch his pallium. Sigeric, formerly a monk of Glastonbury and then abbot of St Augustine’s, Canterbury, had been consecrated bishop of Ramsbury in 985, and became archbishop of Canterbury at the end of 989 or at the beginning of 990, on the death of Archbishop AEthelgar. During the journey, or more likely, once he had returned to England, he committed to writing a diary covering his journey and his stay in Rome.” -Veronica Ortenberg
You can read more about Sigeric’s journey to Rome here