Among the first tasks undertaken upon the exiles’ return was the rebuilding of the altar and the temple. Almost immediately the altar was set up, and regular burnt offerings were resumed. About a year later the foundations of the temple were laid, but opposition from other local governors halted the completion of the temple for over 20 years. Finally, in 515 b.c. (during the reign of Darius) the temple was completed. The city walls, however, would not be rebuilt until about 70 years later under the leadership of Nehemiah.