Tisha B'Av
Tisha B'Av (Hebrew: תִּשְׁעָה בְּאָב IPA: [tiʃʕa bəˈʔav] (listen), lit. "the ninth of Av") is an annual fast day in Judaism, on which a number of disasters in Jewish history occurred, primarily the destruction of both Solomon's Temple by the Neo-Babylonian Empire and the Second Temple by the Roman Empire in Jerusalem.
Tisha B'Av is regarded as the saddest day in the Jewish calendar and it is thus believed to be a day which is destined for tragedy. Tisha B'Av falls in July or August in the Gregorian calendar.