The first picture ever of a quadruple rainbow shows the third-order (left) and fourth-order rainbows (right) -- the first two aren't included in the image.

Photographic evidence for the third-order rainbow, Michael Grossmann, Elmar Schmidt, and Alexander Haussmann, Applied Optics, Vol. 50, Issue 28, pp. F134-F141 (2011) ...

The third-order (tertiary) rainbow (left), accompanied by the fourth-order (quaternary) rainbow (right). They appear on the sunward side of the sky, at approximately 40° and 45°, respectively ...

In addition to the confirmed photo of a tertiary rainbow, ... Photographic evidence for the third-order rainbow. Applied Optics, 2011; 50 (28): F134 DOI: 10.1364/AO.50.00F134; ...