English-speaking societies don't tend to divide the year by four-month periods, so we don't really have a current term that most people would recognize and accept as normal usage.
The obvious term for a three-month period would be "third", or "third of the year", by analogy to "quarter", which is the usual division for business & accounting purposes in England & the U.S. (Back when we were an agricultural people, we spoke of "seasons". Today, unless you work in the theater or a resort town, you're probably more likely to think of "quarters" than of "seasons". "Seasons" in commercial sports are not more-or-less equal divisions of the year.)
Chat with our AI personalities
they get moody at that time of the month
it is called the renaissance.
A century
after the civil war
The Roman Empire's fall left Europe vunerable to the savage attacks of the Vikings and the tribes from the east. Christianity took over for some time, and then the Barbarian tribes from the east came into the west and moved the people further west-ward. After some time, the Vikings came down from the North and first attacked Lindisfarne and then the rest of the monastaries or what not. This era is called the Medieval Era and it goes on for hundreds of years.