2 adjectives to describe 18th

One day"namely, on the aforesaid 18th of March"my master had company to dinner who were speaking about himthe Duke of Roxburghe, the Earl of March, the Earl of Ossory, the Duke of Grafton, Mr. Garrick, Mr. Hume, and a Mr. James."

All were important points in the fortunes of that memorable 18th of June, 1815.

2 adjectives to describe  18th