Definition of "legendarium"

The same society [the Swedish Old-text Society] has begun a continuation of the Old-Swedish Legendarium (in 2 volumes), edited for the society by Professor Stephens.

1866 February, George Stephens, “Scandinavian Book-Lore”, in Sylvanus Urban [pseudonym; Edward Cave], editor, The Gentleman's Magazine and Historical Review, volume I (new series; volume CCXX since the commencement), London: Bradbury, Evans, & Co., 11, Bouverie Street, page 183