[1] Fahlcrantz was born at the parish of Stora Tuna in Dalarna, Sweden.
[5] The following year, he received his Doctor of Theology and entered the rural deanery at Hagunda in the Diocese of Uppsala.
[6] In 1825, he published Noacks Ark, a successful satire on the literary and social life of his time, followed in 1826 by a second part.
In 1835 Fahlcrantz brought out the first part of his epic of Ansgarius, which was completed in 1846, in 14 cantos.
[5][7] In the course of the years 1858-1861 appeared the five volumes of Rom förr och nu, a theological polemic, mainly directed against the Jesuits.