It is called nine centuries.
There is no widely used term for such a period.
A quarter century.
That 1000 years is called the Middle Ages, medieval period, or even Age of Faith.
a quadrennial
900. A century is 100 years.
A Period of ten years is called a decade.
A period of 10 years is called a decade.
A period of 100 years is called a century.
A period of 100 years is called a century.
A period of ten years is a decade.
The period of 100 years is called a century. A period of 10 years is a decade, and 1000 years is a millennium.
A period of 1 thousand year is called a millennium.
a five-year period is a quinquennium
Is called a century
sequincentennial
Decade
A period of 25 years is commonly referred to as a "quarter-century."