Frederik IV reigned from 1699 until 1730. None of the other absolute monarchs in Danish history ruled in as headstrong a fashion as he did. Frederik IV took it upon himself to make as many of the realm's decisions as possible, and this worked remarkably well. With the help of Tordenskjold, he brought Denmark-Norway safely through the bloody Great Northern War, which would be Denmark's final showdown with its arch-enemy Sweden. In his love life, too, he was extremely headstrong - he abducted his beloved Anna Sophie Reventlow, with whom he entered into a morganatic marriage and whom he later made his Queen.
This book is part of the Crown Series , a series of small books on the Danish monarchy and related subjects published in cooperation with the Royal Danish Collection.
This booklet has 57 pages, so you can't expect a thorough biography. This is, however, the only English-language biography of Frederick IV that I've come across, so that's a very great pro.
The booklet features loads of pictures of Frederik, his parents, sister and wives, some castles/palaces, and some vases and other objects like that.