The Cambridge History of India, Vol. I: Ancient India v1.c36.9

v1.c36.9

Chandragupta 321–297 B.C. (pp. 471–2).
The Jain authorities give the year of his accession as 313 (312) B.C., a date at which the canon of the Jain scriptures was fixed (p. 482).
Megasthenes at the court of Chandragupta c. 300 B.C. (pp. 433, 472).
Bindusāra or Amitrochates, successor of Chandragupta: his reign variously stated as of 25, 27, or 28 years (pp. 433, 495).
Açoka 274–237 B.C. Accession 274 B.C. at latest; coronation 270 B.C. at latest; conquest of Kaliṅga 262 B.C. at latest; Buddhist council at Pāṭaliputra 253 B.C. ?; death 237 or 236 B.C. ? (p. 503).
Contemporary Hellenic kings—Antiochus II Theos of Syria 261–246 B.C.; Ptolemy Philadelphus of Egypt 285–247 B.C.; Antigonus Gonatas of Macedon 278–239 B.C.; Magas of Cyrene d. 258 B.C.; Alexander of Epirus 272–258 B.C. ? (p. 502).
Contemporary king of Ceylon—Devānaṃpiya Tissa 247–207 B.C. (p. 608).
Successors of Açoka (pp. 511–3).