There are several defensible answers to such a question.
Why not begin by researching Thomas Aquinas - then, when you understand why Thomas was important (he adapted Aristotelian analytic philosophy to harmonise with Biblical studies) compare his work with that of (say) Duns Scotus Erigena, Roger Bacon, Bernard of Clervaux, and Peter Abelard.
Personally I feel Abelard is much undervalued - but in order to see why Abelard is necessary you have to understand what was wrong with Aquinas.
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The High Middle Ages lasted from 1000 AD to 1250 AD
The third period of the Middle Ages was the Late Middle Ages. The first is called the Early Middle Ages or the Dark Age. The second period was the High Middle Ages.
The Roman Empire was followed by the Middle Ages: Early Middle Ages (5th to 10th century), High Middle Ages (c. 1001 to 1300) and Late Middle Ages (1300 to 1500).
the age before the dark ages is the high middle ages
At the beginning of the High Middle Ages, the architecture was Romanesque. Later in that time, the Gothic emerged.
The High Middle Ages witnessed the development of Gothic architecture. It was also the time of Scholastic philosophy, as represented by St. Thomas Aquinas.
The High Middle Ages lasted from 1000 AD to 1250 AD
Early Middle Ages 400 - 700, High Middle Ages 700 - 1300, Late Middle Ages 1300 -1500.
The third period of the Middle Ages was the Late Middle Ages. The first is called the Early Middle Ages or the Dark Age. The second period was the High Middle Ages.
The Roman Empire was followed by the Middle Ages: Early Middle Ages (5th to 10th century), High Middle Ages (c. 1001 to 1300) and Late Middle Ages (1300 to 1500).
the age before the dark ages is the high middle ages
At the beginning of the High Middle Ages, the architecture was Romanesque. Later in that time, the Gothic emerged.
I am not quite sure what the early and high middle ages are most commonly known as, however, I do know that the late middle ages are known as the Gothic era.
illumination
the high middle ages
A new form of architecture that emerged in the high Middle Ages was called the French style, or Gothic architecture.
The period from the late 5th century to 1500 is called the Middle Ages. It is subdivided into the Early Middle Ages (from the late 5th century to the 10th century) High Middle Ages (c. 1000-1300) and Late Middle Ages (1300-1500).