4D2. Roman numerals:

When roman numerals appear as Gregorian or Julian years, change them to arabic numerals unless they are erroneous or misprinted. Example 1

Transcribe years other than Gregorian or Julian as they appear. Example 2

Optionally, if it is considered important to retain in the catalog record the exact expression of the date, transcribe the date as it appears in roman numerals and add the date in arabic numerals in square brackets. Example 3