Rev Lancelot Edward Threlkeld takes up land near Ebenezer on the Hawkesbury River in the country of Aborigine Yellomundy. There he preaches at the Ebenezer church and learns some of the Darkinung language at Portland Head Rock. Threlkeld refers to his “black teacher” (unnamed) from whom he is getting words while publishing his first treatise on Aboriginal language (published 1827). (Ford p327).