AD means ano domini - "in the year of our Lord [Jesus Christ]". A century is 100 years. Therefore, the first century is years 1-100, the second century 101-200, etc.
The first century AD
The sixth century AD covers the years from 501 AD to 600 AD.
-99
125
Any year between 1501 AD and 1600 AD - including 1537 - is in the sixteenth century.
St Florian was born in the 4 century about 250 AD in Cetium Austria
1st century AD
It is the first century AD.
The 1st century AD.
It is the 18th century AD.
The first century AD.
It is the second century AD.
The 1st century AD.
The 1st century AD.
The first century AD.
The 3rd Century AD.
It is the first century AD.