It is the first century AD.
1st century AD
The first century AD.
The 3rd Century AD.
It is the first century AD.
The 1st century AD.
The 1st century AD.
The 1st century AD.
It is the second century AD.
The first century AD.
It is the 18th century AD.
seventeenth century
79-81 AD was the 1st century AD.