Abu Yaqoub Ishaq bin Abi Ishaq Ibrahim bin Muhammad Ibn Abd al -Rahman al -Sarkhasi al -Harawi, known as al -Qarab, died 429. Abu Yaqoub Ishaq bin Abi Ishaq Ibrahim bin Muhammad Ibn Abd al -Rahman al -Sarkhasi al -Harrawi, known as al -Qarab, died 429. Abu Yaqoub Ishaq bin Abi Ishaq Ibrahim bin Muhammad Ibn Abd al -Rahman al -Sarkhasi al -Hurawi, known as al -Qarab, died 429. Abu Yaqoub Ishaq bin Abi Ishaq Ibrahim bin Muhammad Ibn Abd al -Rahman al -Sarkhasi al -Harwi, known as the Kirab, died 429