We are now surprised to find Ezra writing about letters sent to Ahasuerus and, in the next verse, to Artaxerxes. Ezra 4 begins by describing the offer of the Samaritans to build the house of God together with the Jews who have returned from Babylon.
The dates of periods covered by the relevant prophets during the post exilic period are as follows: Ezra (538-458) BC); Haggai (520-520 BC); Zechariah (520-480? BC); Esther (483-471 BC); Nehemiah (444-c430 BC), and Malachi (c430 BC). The order and dates of the Persian rulers during these years are: Cyrus (539-530 BC); Cambyses (530-522 BC); Darius I (522-486 BC); Xerxes I (Ahasuerus) (486-465 BC); and Artaxerxes I (Longimanus) (486-423 BC). The key events during this time are the decree of Cyrus issued soon after he began to rule, and the 1st return under Zerubbabel (Ezra 1:1), which took place in 538 BC. The second temple began to be built in 537 BC and its foundation stone was laid in 536 BC. After a period of inactivity lasting 16 years Haggai was called to encourage the rebuilding work in the 2nd year of Darius I (Ezra 4:24) (520 BC) and the temple was completed in 516 BC. Zechariah had also been called as a prophet to work alongside Haggai in 520 BC. The events of the Book of Esther take place during the reign of Xerxes I (Ahasuerus) (Esther 1:3; 3:7) from 483 to 471 BC and it was Ahasuerus to whom Esther was married. This is the king named in Ezra 4:6 to whom the Samaritans wrote and in Ezra 4:7 they also wrote to Artaxerxes, his successor. But these kings did not reign until many years after the temple had been completed. The Book of Ezra spans a period of 80 years. It starts in the reign of Cyrus, and finishes in the reign of Artaxerxes. Ezra does not personally feature in the book until chapter 7. It is at this time that he asks permission from Artaxerxes I to lead a 2nd group of Jews back to Jerusalem in 458 BC. The Book of Ezra then ends within 8 months of his arrival (Ezra 7:9; 10:17). Further interference from the Samaritans takes place and there is a second suspension of the work until about 445 BC. It is at the time of this further interference that the letter recorded in Ezra 4:6-23 is probably sent. It is chronologically out of order in Ezra 4, but Ezra’s purpose seems to be to group together different examples of the tactics of the adversaries collected from different periods. There is a 3rd return under Nehemiah who joins an aged Ezra in Jerusalem (445 BC). Nehemiah serves as governor in Jerusalem (Nehemiah 1:1; 5:14 13:6-7) from 445 to 433 BC. Nehemiah returns to Susa as per the original agreement with Artaxerxes (Nehemiah 2:6), comes back a second time to Jerusalem around 430 BC, where he encounters the same problem faced earlier by Ezra – the problem of mixed marriages.