Meanwhile , the Persian shah Khosrau II had secured control of Dara and was mobilizing his troops for a large - scale invasion into Byzantine territories .
Phocas 's regime arguably needed the grain and revenues from Africa , while the Exarchate sustained itself with relative ease .
The Persian shah Khosrau II had secured control of Dara and was mobilizing Phocas ' troops for a large - scale invasion into Byzantine territories .
Phocas 's regime arguably needed the grain and revenues from Africa , while the Exarchate sustained itself with relative ease .