Other notable documents held at the Notarial Archives include a number of 15th and 16th century documents relating to Gozo before the raid of 1551 in which the island's records were destroyed, an eyewitness account of the Great Siege of Malta of 1565, contracts relating to the distribution of land from when Valletta was being built in the 16th century and contracts relating to the purchase of slaves. Later documents held by the archives include an 1861 letter franked with the first printing of Malta's first stamp, the Halfpenny Yellow.