Assertion: martial art's technique | /r/HasProperty | practiced
Facets:
value: during that period
type: TEMPORAL
Source sentences:
text: In 1935, paintings that showed martial arts were found on the walls of royal tombs believed to have been built for Goguryeo kings sometime between the years 3 and 427 AD.[citation needed] Which techniques were practiced during that period is, however, something that cannot be determined from these paintings.