Hesper Starkey

Hesper Starkey (1881 - 1973) was a witch who studied how the moon's phases affected potion fabrication.

History
In 1993-1994, a portrait of her guarded a secret room at Hogwarts, to which the password (obtainable only from Fred and George Weasley) was Lunartickle.

Magical abilities and skills

 * Potions: Starkey was a skilled and renowned potioneer who was highly proficient in the art of potion-making, as she discovered how the phases of the moon affected the fabrication of potions.
 * Astronomy: Starkey was also very knowledgeable in this branch of science, as she studied and discovered how the phases of the moon affected potion-brewing, a significant achievement in the field of astronomy as well.