The period begins with the arrival of Augustine in Britain in 597 AD and is sometimes considered to end in 1066 AD, though writing in Latin in Britain continued to the fifteenth century and beyond.
References
“Anglo-Latin” in The American Heritage Dictionary of the English Language, Fourth Edition, Houghton Mifflin Company, 2000.
“Anglo-Latin” in Dictionary.com Unabridged, v1.0.1, Lexico Publishing Group, 2006.