Several centuries
It is called Centenary.
It is called a "centennial celebration"
A three-hundred-year celebration is called a tricentennial.
bicentennial
The Spartans were at war every few years for several hundred years.
He painted about several hundred paintings of dancers on the stage, from 1870 onwards. One of the best known is called L'étoile (the Star), painted in 1878.
A period of 100 years is a century
A one-hundred-year-old person can be called a Centenarian.
There have been several, one was called the Hundred Years War
several hundred is more than 200 but less than 1000
a humpback whale
The two-hundred-year period in Roman history marked by freedom stability and peace was called the Pax Romana.