Commentary for Rosh Hashanah 4:2
לא צריכא דאימנו עליה מאדר מהו דתימא נימנו ליה תרתין שנין קמ"ל
in Adar. You might think that in that case we should reckon him [by the next first of Nisan] to have reigned two years. We are therefore told [that this is not so].
Rashi on Rosh Hashanah
Where they appointed him - the princes met and concluded that he should be appointed
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