Daniel 8:16-17

Gabriel : a specific angel,an angel who brought understanding to the prophet Daniel

Ulai : a river flowing through Susa, Persia into the Euphrates delta
(32° 10´, 48° 13´)

Daniel 9:22-23

Daniel : the prophet who wrote the book of Daniel,son of David and Abigail,head of clan (Ithamar Levi) who pledged to obey God's law,prophet who wrote the book of Daniel