A period of 100 years is a century
the rock and soil
It is called Centenary.
It is called a "centennial celebration"
A three-hundred-year celebration is called a tricentennial.
Several centuries
bicentennial
A one-hundred-year-old person can be called a Centenarian.
The two-hundred-year period in Roman history marked by freedom stability and peace was called the Pax Romana.
A period of 600 years is often referred to as a sexcentenary.
Pax Romana
The Hundred Year Lie was created in 2006.
The Hundred-Year Christmas was created in 1983.