The mass execution of 335 Moroccans by the Sultan Muley Abdallah: a group of men shackled by chains to each others' necks… https://www.rawpixel.com/image/13985938/image-horse-people-artFree Image from public domain licenseNarrative of a journey to Morocco, in 1863 and 1864 : with geological annotations / [Thomas Hodgkin]. https://www.rawpixel.com/image/13975328/image-paper-public-domain-lineFree Image from public domain license