sentence - Usage of 'AD' era designation

Considering the sentence:

AD 1453, the city of Constantinople was conquered by the Ottoman empire.

Is this a complete sentence?

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From what I understand of the situation:

The era designator 'AD' is an abbreviation for 'Anno Domini',
meaning 'In the year of the Lord'.
By that reasoning, 'AD 1453' is a complete dependent clause.

Disregarding any current practice regarding
AD vs CE,
factual accuracy,
or other concerns,
is this actually a complete sentence?

What would be the recommended arrangement
for using 'AD' as an era designator
in this situation?

Alternate ways of writing it might include
placing the era designator after the year,
placing the words 'in'/'in the year'/etc. before the date,
or a combination of changes.
Which of those alternatives would be the most correct way to use 'AD' as an era designator?