Qetsiyah

Qetsiyah (Ancient Greek: Θετσιψαη, Hebrew: קעצייאַה, Arabic: كاتسيا, Syriac: ܩeܬܣiܝܐܗ; translates as "cassia"), known in modern-times as Tessa, was the most powerful witch of the Traveler subculture, as well as "one of the most powerful witches of all time". Qetsiyah is best known for creating the first Immortality Spell, and subsequently the first immortals, the Cure for immortality, and the supernatural purgatory known as the Other Side.
Qetsiyah was engaged to another witch named Silas, with whom she was madly in love. At his request, Qetsiyah concocted an immortality elixir that she had planned to share with him as a part of their wedding ceremony. However, after Silas betrayed Qetsiyah by taking the potion with her handmaiden, Amara, and his soulmate, Qetsiyah retaliated by kidnapping Amara, and using her immortal and indestructible body to bind the spell that created the Other Side. Deceived into believing that Amara was dead, she imprisoned Silas deep within a remote cavewith the cure to his immortality. She believed that Silas would eventually take the cure and die as a mortal, thus joining her on the Other Side. In spite of this, Qetsiyah spent the next two millennia in her own purgatory as he refused and laid desiccated.
The Travelers eventually killed Qetsiyah, likely due to her and Silas' role in the creation of the immortality spell. The Travelers were not fans of immortality and were resentful for its creation. It's creation caused a schism in the magical community which brought about The Travelers' Curse by the witches. After her death, the Travelers took Amara's body and made sure to move it constantly so that no one would ever find it.
Centuries later, one of her descendants created the Brotherhood of the Five, tasked to find Silas and force the cure down his throat, and kill him. When her hunter's failed in their task, Qetsiyah took the opportunity to resurrect herself from the Other Side to kill Silas. Though she was ultimately not the one to end Silas' life, she eventually got her wish when her alliance with the Mystic Falls Gang which led to Stefan killing him in Death and the Maiden. Once Silas and Amara were dead, Qetsiyah declared herself having won and her revenge against Silas obtained. Having completed her centuries-old vendetta, she killed herself by slitting her wrists. With her vengeance fulfilled, it is believed that she finally found peace after passing through the Anchor.
Qetsiyah was a distant ancestor of the Bennett Family.