The 7th and first half of the 8th century are generally considered to be the era in which the Tang reached the zenith of its power. In this period, Tang control extended further west than any previous dynasty, stretching from north Vietnam in the south, to a point north of Kashmir bordering Persia in the west, to northern Korea in the north-east.
The 7th and first half of the 8th century are generally considered to be the era in which the Tang reached the zenith of its power In this period Tang control extended further west than any previous dynasty stretching from north Vietnam in the south to a point north of Kashmir bordering Persia in the west to northern Korea in the north-east