Sayyadina is a Fremen word that translates to: "Friend of God." It was the name given to the lower-ranking priestess of the Fremen. Because the Fremen got influenced by the Bene Gesserit, the Sayyadina underwent a deadly process that involved her taking the water of life. On succeeding the test of the water of life, the Sayyadina gained access to Other Memory and became a reverend mother. After the House of Atreides fell, Jessica and Paul escaped into the desert and became a part of the Sietch Tabr. In the Sietch Tabr, Jessica took the water of life while pregnant with Alia; this turned her into a reverend mother. However, Jessica taking the water of life introduced Alia to the abomination