To those who may believe the Artaxerxes in question was Mnemon, what is thought about the Elephantine Papyrus which refer to a "Jochanan" as chief priest, Darius [II] as king, and Arsames [a satrap]? The problem that I see is that this text refers to events in the late 5th century BCE, while Nehemiah refers to Eliashib as high priest (Neh 3:1,30; 13:28), although Jochanan is referred to as special enough to have his own chamber apparently in the temple area that Ezra went to (Ezra 10:6). The 7th or 20th year of Artaxerxes Mnemon would be early 4th century BCE. Jochanan was Eliashib's grandson. For Jochanan to be actually the high priest in the late 5th century BCE with Darius II as king, the Artaxerxes in question would, to me, have to be Artaxerxes I (Longimanus) referred to, at least in Nehemiah where Eliashib is specifically referred to as "high priest".
The only solution off hand that I see is that the Elephantine Papyrus refers to Jochanan as 'rosh' priest, [a] 'chief priest', not necessarily הַכֹּהֵ֣ן הַגָּדֹ֔ול , the gadowl kohen, the high priest. Just as the Elephantine authors wrote to the sons of Sanballat, while he was actually still governor, they wrote to Jochanan as a chief priest, not necessarily him as the high priest. Or, Jochanan was acting high priest.
Regardless, this seems to be an issue for referring to the relevant "decree" as coming from Artaxerxes II (Mnemon) and not Artaxerxes I (Longimanus).
I'm not trying to claim that Daniel was prophesying about Jesus, and as much as I'd like to think the 7th and 20th years of Artaxerxes (or one of them) was really referring to Mnemon, the problem of the Elephantine Papyrus I think should be addressed. Thanks for any help.
Here's a link to the relevant papyrus,
http://www.kchanson.com/ANCDOCS/westsem/templeauth.html