You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'ORDER BY issue DESC, `year` DESC ) QQ WHERE `year`<2100 ORDER BY modified DES...' at line 1 Bibliographies | Miko Flohr
 

De Ligt, L. and L.E. Tacoma (2016). Migration and Mobility in the Early Roman Empire. Studies in Global Migration History 23/7. Leiden: Brill.