Tisha B'Av is an annual fast day in Judaism, on which a number of disasters in Jewish history occurred, primarily the destruction of both the First Temple by the Babylonians and the Second Temple by the Romans 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.
The account of Josephus described Titus as moderate in his approach and, after conferring with others, ordering that the 500-year-old Temple be spared. According to Josephus, it was the Jews who first used fire in the Northwest approach to the Temple to try and stop Roman advances. Only then did Roman soldiers set fire to an apartment adjacent to the Temple, a conflagration which the Jews subsequently made worse.[15]
Brandon Ortiz
And truly, the very view itself was a melancholy thing; for those places which were adorned with trees and pleasant gardens, were now become desolate country every way, and its trees were all cut down. Nor could any foreigner that had formerly seen Judaea and the most beautiful suburbs of the city, and now saw it as a desert, but lament and mourn sadly at so great a change. For the war had laid all signs of beauty quite waste. Nor had anyone who had known the place before, had come on a sudden to it now, would he have known it again. But though he [a foreigner] were at the city itself, yet would he have inquired for it.