Hasan was a mercurial force in the digital art history space, and created a devoted community of Renaissance art lovers around his blog.

Sensory impressions derived from bright colours drew the onlooker from the material to the immaterial, bringing the divine into human life.

Caravaggio - far from being out of step with his time - was powerfully in synch with the ideals and obsessions of Counter-Reformation Italy.

While realistic illusion had great power to touch the humanity of Christian followers, irreality was essential to help them transcend it.

The moment I heard about this exhibition, the first outside Italy to focus on Pietro Perugino exclusively, I booked my flight.

Painter Hubert van Eyck, greater than whom none has been found, began the weighty task, which his brother Jan, second in art, completed.