I want to know the answer to the following question:
In what century did the Winchester standard arise?
All the background I'm provided with is that "A later literary standard, dating from the later 10th century, arose under the influence of Bishop Æthelwold of Winchester, and was followed by such writers as the prolific Ælfric of Eynsham ("the Grammarian").". Is that enough to answer the question?
Answer: yes