Coenraad Laurens Coolen (1775 in Ungaran – 2 July 1873, in Mojokerto)[1] is one of the lay evangelists who did some of the first evangelical work in East Java.
[2] Despite his Dutch surname and given names, his father supposedly was from Russia and his mother was a daughter of Prince Kojaran of the noble family of Mataram.
[2] While there, he came into contact with a group of pious commoners named "the Surabaya Saints" led by the German watchmaker Johannes Emde.
[2] After some years working for the military and the forestry service, Coolen obtained permission to clear forest in the Ngoro region near Mojoagung [id], Jombang).
His assistants Paul Tosari and Abisai Ditatruna founded a new village Mojowarno [id; nl], which for the next century would become the center of Christianity in East Java.