Melinda Warren was the beginning of the Halliwell bloodline. She possesed three different powers, the same powers that Piper, Phoebe, Prue, and Paige have, but she doesn't share Paige's Whitelighter powers. She also foretold of the coming of the Charmed Ones. Here is the entry in the Book of Shadows on her.
Melinda Warren left England and arrived in America in 1654 with her two-year old daughter, Prudence. Her descendants include branches of the Grants, the Morgans, and the Marstons. Never forgetting her knowledge of witchcraft, Melinda Warren possessed three special powers: The first, telekinisis, or moving objects using only the power of her mind. The second, clairvoyance, or the ability to see the future. Her third power, to stop time. Melinda Warren's powers were discovered when her lover, Matthew Tate, betrayed her to the townspeople. She was tried for witchcraft, found guilty, and sentenced to be burned at the stake -- a sentence that was never given before. The townspeople tied her to a stake in the center of the village. The executioner waved a flaming torch before her and asked if she had any last words, This is what she said: "You may kill me, but you can not kill my kind. With each generation, the Warren witches will grow stronger -- until, at last, three sisters will arrive. Together, these three sisters will be the most powerful witches the world has ever known. They will be the Charmed Ones." The executioner then touched his torch to the straw beneath Melinda's feet. She died horribly -- but her power lives in every Warren witch's heart. It will be a joyous day when the Charmed Ones are begotten.


***This information was compiled from the Power of Three novel.