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View of one of the well–preserved walls of Herod the Great's Third Palace at Jericho.
The stones that are laid diagonally are called opus reticulatum. The long portion of each brick, wedge–shaped, but not really visible, is set in plaster that faced the rubble core. The opus reticulatum was then covered with layers of plaster and/or frescos—see the bottom of the wall for plaster remnants.
At the far corner of this wall (left side of image), by the doorway, the end of the wall is made out of opus quadratum. These stones are actually rectangular in shape and are laid like bricks are today.
These types of walls were very common in other parts of the Roman Empire for they could be mass–produced inexpensively—typically mud bricks would be formed and "fired" by unskilled labor. BUT here, Herod actually used carved pieces of STONE, not mud bricks!
This type of wall is not common in buildings constructed during the days of Herod the Great. Netzer believes that after the visit of Marcus Agrippa , Augustus' son–in–law and confidant, in 15 BCE, that Agrippa sent workmen to assist Herod in his remaining building projects (Herod died in 4 BCE) which included the building of this, the "Third Palace of Herod" at Jericho.
See Netzer, Ehud, and Rachel Laureys–Chachy. The Architecture of Herod, the Great Builder. Grand Rapids: Baker Academic, 2008, pp. 314–15.