Early Mishima Bowl

The note that was written for me when I was given this rice bowl reads: "Found at Kwangju, which was the ancient capital of Chosun. Unearthed by some farmers in the temple area. Belongs to the Yi Dynasty which dates from 1392. This was a Golden Age similar to the Elizabethan era in England, and during this period art and pottery flourished. Noting the markings on the bowl it is estimated to be in the vicinity 1400 - 1500 [C.E.] Comparing with some of the pottery pieces of the later part of the Dynasty." I can only take their word for this but would love to know more as I feel it is from an even earlier age.