These writers concern themselves with the size of the Hanging Gardens, their overall design and means of irrigation, and why they were built.
Josephus (c. 37–100 AD) quotes a description of the gardens by Berossus, a Babylonian priest of Marduk,[6] whose writing c. 290 BC is the earliest known mention of the gardens.[5] Berossus described the reign of Nebuchadnezzar II and is the only source to credit that king with the construction of the Hanging Gardens.[12][13]

.mw-parser-output .templatequote{overflow:hidden;margin:1em 0;padding:0 40px}.mw-parser-output .templatequote .templatequotecite{line-height:1.5em;text-align:left;padding-left:1.6em;margin-top:0}In this palace he erected very high walls, supported by stone pillars; and by planting what was called a pensile paradise, and replenishing it with all sorts of trees, he rendered the prospect an exact resemblance of a mountainous country. This he did to gratify his queen, because she had been brought up in Media, and was fond of a mountainous situation.[14]
Hanging gardens of Semiramis, by H. Waldeck
Diodorus Siculus (active c. 60–30 BC) seems to have consulted the 4th century BC texts of both Cleitarchus (a historian of Alexander the Great) and Ctesias of Cnidus. Diodorus ascribes the construction to a Syrian king. 