Bartholomeus Spranger in the context of "Karel van Mander"

Northern Mannerism is the form of Mannerism found in the visual arts north of the Alps in the 16th and early 17th centuries. Styles largely derived from Italian Mannerism were found in the Netherlands and elsewhere from around the mid-century, especially Mannerist ornament in architecture; this article concentrates on those times and places where Northern Mannerism generated its most original and distinctive work.

The three main centres of the style were in France, especially in the period 1530–1550, in Prague from 1576, and in the Netherlands from the 1580s—the first two phases very much led by royal patronage. In the last 15 years of the century, the style, by then becoming outdated in Italy, was widespread across northern Europe, spread in large part through prints. In painting, it tended to recede rapidly in the new century, under the new influence of Caravaggio and the early Baroque, but in architecture and the decorative arts, its influence was more sustained.

In Greek mythology, Glaucus (/ˈɡlɔːkəs/; Ancient Greek: Γλαῦκος, romanized: Glaûkos, lit. 'glimmering') was a Greek prophetic sea-god, born mortal and turned immortal upon eating a magical herb. It was believed that he came to the rescue of sailors and fishermen in storms, having earlier earned a living from the sea himself.