Konstantinos is a masculine given name of Greek origin, derived from the ancient Greek word "konstantinos", which means "constant" or "steadfast". The name's roots can be traced back to the Byzantine Empire, where it was widely used among the ruling class and the elite.

The name first appeared in historical records during the 4th century AD, when it was borne by several prominent figures in the Byzantine Empire. The most notable among them was Constantine the Great (272-337 AD), the first Roman emperor to convert to Christianity and establish it as the official religion of the empire.

In the Eastern Orthodox Church, the name Konstantinos holds significant importance, as it is associated with several saints and martyrs. One of the earliest examples is Saint Constantine the Great, who was canonized for his role in promoting Christianity and convening the First Council of Nicaea in 325 AD.

Throughout history, the name Konstantinos has been borne by various notable individuals, including:

1. Konstantinos VII Porphyrogennetos (905-959 AD), a Byzantine emperor known for his scholarly works and patronage of the arts.
2. Konstantinos Palaiologos (1405-1453 AD), the last Byzantine emperor who defended Constantinople against the Ottoman Turks in 1453.
3. Konstantinos Kanaris (1793-1877), a Greek naval commander and hero of the Greek War of Independence.
4. Konstantinos Kavafis (1863-1933), a renowned Greek poet whose works explored themes of longing, nostalgia, and the pursuit of beauty.
5. Konstantinos Mitsotakis (1918-2017), a Greek politician who served as Prime Minister of Greece from 1990 to 1993.

The name Konstantinos has maintained its popularity and significance throughout the centuries, particularly in Greece and other parts of the Eastern Mediterranean region. It has been a source of inspiration and a symbol of steadfastness, reflecting the rich cultural and historical heritage of the Greek-speaking world.