Slytherin's Basilisk

The Serpent of Slytherin was a female Basilisk that was placed by Salazar Slytherin in the Chamber of Secrets at Hogwarts School of Witchcraft and Wizardry. The Basilisk could only be controlled by the Heir of Slytherin, Tom Riddle. Other Parselmouths (such as Harry Potter) had no control over her, though they still could understand her.

Herpo the Foul's Basilisk

This Basilisk, bred by the Ancient Greek Dark wizard Herpo the Foul, was the first recorded Basilisk in history. After much experimentation, Herpo the Foul discovered that this giant serpent could be produced by hatching a chicken egg beneath a toad. Herpo was able to control the Basilisk as he was able to speak Parseltongue. It is said that this particular Basilisk lived to be almost 900 years old.