 It occurred during the Years of the Trees, when all of Middle-earth was controlled by the forces of Melkor.The Vala Aulë had become impatient for the arising of the Children of Ilúvatar, and created the seven Fathers of the Dwarves in secret, intending them to be his children to whom he could teach his crafts.He also taught them Khuzdul, a language he had devised for them.