The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
339. The Subject of a finite verb is in the
- Caesar Rhénum
tránsíre décréverat (B. G. iv. 17),
Caesar had determined to cross the Rhine.
For the omission of a pronominal subject, see § 296. a.
a. The nominative may be used in
- én dextra fidésque
(Aen. iv. 597), lo, the filth and plighted word !
- ecce tuae litterae de Varróne
(Att. xiii. 16), lo and behold, your letters about Varro !
NOTE: But the accusative is more common (§ 397. d).