The Regnal year 12 Elizabeth I is from 17 Nov 1569 to 16 Nov 1570, per Cheyney's Handbook Book of Dates. So, in your example 07 January would be 1569 Julian; and that year needs to be corrected to the Gregorian calendar year of 1570. I would quote it as 1569/70 to avoid the doubt as to which year the event takes place. Best wishes, Marion Woolgar Bognor Regis, West Sussex