Context: Extending the Gregorian calendar backwards to dates preceding its official introduction produces a proleptic calendar, which should be used with some caution. For ordinary purposes, the dates of events occurring prior to 15 October 1582 are generally shown as they appeared in the Julian calendar, with the year starting on 1 January, and no conversion to their Gregorian equivalents. For example, the Battle of Agincourt is universally considered to have been fought on 25 October 1415 which is Saint Crispin's Day.

Question: Attempting to use Gregorian dates for earlier events  on the Julian calendar should be used with what action?
Answer: caution

Question: When are events usually shown as they appeared on the Julian calendar?
Answer: prior to 15 October 1582

Question: When was the Battle of Agincourt?
Answer: 25 October 1415

Question: What other date is 25 October known for, that keeps the Battle of Agincourt on 25 October,1415?
Answer: Saint Crispin's Day

Question: In the Julian calendar when is the start of the new year?
Answer: 1 January

Question: What can you extend backwards to create an accurate calendar?
Answer: Unanswerable

Question: What events are shown as they appeared on the Julian calendar with the year starting as it did when they occurred?
Answer: Unanswerable

Question: What is the disputed date for St. Crispin's Day?
Answer: Unanswerable

Question: What started in January Julian calendar?
Answer: Unanswerable