• -3495 DR
  • Birth of Congenio Ioun, the first major arcanist of Netheril and the creator of the Ioun's Stone. »

  • -3462 DR
  • Congenio Ioun, at the age of 33, creates his first magical item, Congenio's pebbles (later known as Ioun's Stones). During his lifetime, he creates over 30 different kinds of Ioun Stones. »

  • -2680 DR
  • Congenio Ioun changes the names of his magical items (Congenio's Pebbles) to Ioun's Stones. »

  • -2540 DR
  • Death of Congenio Ioun of Netheril. He was always seen with his Ioun's Stones circling his head, and it was rumored that one of Congenio's creations was responsible for his long life. He was also a suspected student of the Terraseer, but it was never proven. »