<Tr> <Td_colspan="2"> Destruction of the Temple of Jerusalem, by Francesco Hayez </Td> </Tr> <Tr> <Th> Official name </Th> <Td> Hebrew: תשעה באב ‬ English: Ninth of Av </Td> </Tr> <Tr> <Th> Observed by </Th> <Td> Jews </Td> </Tr> <Tr> <Th> Type </Th> <Td> Jewish religious and national </Td> </Tr>

Why do we fast on the 9th of av