Daniel 9:1 KJV

In the first year of Darius the son of Ahasuerus, of the seed of the Medes, which was made king over the realm of the Chaldeans;

Daniel considers the time of the captivityDaniel learned from the books of the prophets, especially from Jeremiah, that the desolation of Jerusalem would continue seventy years, which were drawing to...

Daniel 11:1 Also I in the first year of Darius the Mede, even I, stood to confirm and to strengthen him.
Daniel 1:21 And Daniel continued even unto the first year of king Cyrus.
Daniel 5:31–6:1 And Darius the Median took the kingdom, being about threescore and two years old. …
Daniel 6:28 So this Daniel prospered in the reign of Darius, and in the reign of Cyrus the Persian.

From OpenBible.info, most relevant first.

DariusThe holder or supporter, the name of several Persian kings. (1.) Darius the Mede (Dan 11:1), “the son of Ahasuerus, of the seed of the...
AhasuerusThere are three kings designated by this name in Scripture. (1.) The father of Darius the Mede, mentioned in Dan 9:1. This was probably...

In the first אַחַת ʾaḥat אֶחָד Number · feminine singular
year בִּשְׁנַת bišnat שָׁנֶה Noun · feminine singular construct · with preposition
of Darius לְדָרְיָוֶשׁ lĕdoryāweš דָּֽרְיָוֵשׁ Proper name · with preposition
the son בֶּן ben בֵּן Noun · masculine singular construct
of Ahasuerus אֲחַשְׁוֵרוֹשׁ ʾăḥašwērôš אֲחַשְׁוֵרוֹשׁ Proper name
of the seed מִזֶּרַע mizzeraʿ זֶרַע Noun · masculine singular construct · with preposition
of the Medes מָדָי mādāy מָדַי Proper name
which was made king אֲשֶׁר ʾăšer Relative הָמְלַךְ hāmĕlak מָלַךְ Verb · hophal perfect, third person masculine singular
over the realm עַל ʿal Preposition מַלְכוּת malkût מַלְכוּת Noun · feminine singular construct
of the Chaldeans כַּשְׂדִּים kaśdîm כַּשְׂדִּי Proper name

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