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Dragons

drogon

Drogon is one of the three dragons born in the wastelands beyond Lhazar,
along with Rhaegal and Viserion. He is named after Daenerys's late husband Khal Drogo. He can be distinguished by his black and red colored scales, and red-black wings. He was also Daenerys's personal mount. Drogon is currently the last of his siblings and of any known living dragon in existence.
rhaegal

Rhaegal was one of the three dragons born in the wastelands beyond Lhazar, along with Drogon and Viserion. He was named after Daenerys Targaryen's eldest brother, Rhaegar. He could be distinguished by his green and bronze colored scales, and his yellow-orange colored wings. Daenerys allowed Jon Snow to ride Rhaegal shortly before and during the Battle of Winterfell. Later in season eight rhaegal was shot out of the air by euuron. he died by a scorpian bolt through the neck
viserion

Viserion was one of the three dragons born in the wastelands beyond Lhazar, along with Drogon
and Rhaegal, and was named after Daenerys Targaryen's elder brother, Viserys. Before his death
at the hands of the Night King (and subsequent reanimation as wight), he could be distinguished
by his cream and gold colored scales, and red-orange wings. As an ice dragon he lost his free
will and was enslaved by the Night King. He was also able to breath fire that was capable of
melting anything, though it was blue in color.

During Agon Targerians conquest

Aegon's Conquest, also called the Conquest, was the campaign in which
Aegon I Targaryen conquered most of Westeros. Together with his sisters, Visenya and Rhaenys, and their dragons,
Vhagar and Meraxes, Aegon subdued six of the Seven Kingdoms, successfully resisted only by Dorne.

During this conquest Agon Targaryen had a dragon named Balerion,
this dragon was twice the size of Drogon and twice as strong. Balerion had a nickname, "The Black Dread".
This was because he was fully black and virtually unstoppable.