Rembrandt van Rijn (1606–1669) was Amsterdam's most sought-after portraitist by the 1640s. In 1639, the Kloveniersdoelen — the city's musketeer militia guildhall — commissioned six large group portraits for its new ceremonial hall; Rembrandt's share was the company of Captain Frans Banninck Cocq. The painting's actual title is *Militia Company of District II under the Command of Captain Frans Banninck Cocq*; the nickname 'Night Watch' was attached only in the eighteenth century, after the varnish had darkened. Modern cleaning has confirmed that the scene takes place in daytime.

The innovation is a breach of contract. The conventional militia group portrait of the period was a static, equal-sized, evenly lit row of paying patrons — everyone paid, everyone saw their face. Rembrandt broke the rule: he placed the figures in motion, dropped some into shadow, and inserted a luminous, unexplained girl into the composition. The story — later largely disproved — was that some sitters complained about being obscured. The view of the painting as the start of Rembrandt's downfall comes from nineteenth-century Romantic biography; contemporary documents show no such crisis.

Technically, the work is the high point of Dutch Golden Age light. Captain Cocq and his lieutenant Willem van Ruytenburch step forward in full illumination; the rear ranks recede into half-shadow, lending the scene depth. The *tenebrismo* Caravaggio had pioneered is here brought into the group portrait.

In 1715 the canvas was moved to Amsterdam's town hall and trimmed on all sides; the original composition was only visually reconstructed in 2021 via AI-assisted restoration. It now hangs at the head of the Rijksmuseum's Gallery of Honour in a hall purpose-built for it, drawing some 2.5 million visitors a year.