Rostam was an Iranian warrior who reappears periodically over a period of three hundred years to drive back the Turks.
The answer is tercentenary or tercentennial depending on whether you need a noun or an adjective.
THe Punic wars
Three Hundred Years Hence was created in 1950.
a century
a century
Three Hundred Years Hence has 131 pages.
A period of 100 years is a century
The first insects appeared in the Devonian, over three hundred fifty million years ago.
someone knows
A period of 100 years is called a century.
A period of 100 years is conveyed by the single word century.
a decade is ten years, a century is one hundred years. one hundred times three is three hundred. three hundred divided by ten equals thirty