[1] Diogenes Laertius 7.76 (a Stoic definition in the life of Zeno).
[2] Diogenes Laertius 7.177 -- but here misread: the philosopher in question is not Cleanthes (kappa 1711) but his pupil Sphaerus (SVF 1.139-142 von Arnim: no Suda entry of his own, and indeed ignored throughout the lexicon). The 'Ptolemy' in the anecdote is identified by D.L. as pi 3039, P. IV Philopator (OCD(4) s.v. wrongly says P. II Philadelphus). As to Sphaerus himself, D.L. twice calls him 'of Bosporus', though in Plutarch, Cleomenes 2.2-3 he is 'of Borysthenes' (a.k.a. Olbia, in the present-day Ukraine). The second of these designations might simply be a more precise version of the first. In any event, Plutarch in that passage asserts that Sphaerus visited Sparta and made an intellectual impact on its young men, notably the one who in 235 BCE (at the age of c.24) would become the reforming Agiad King Cleomenes III. How far, if at all, the teachings of Sphaerus can be supposed to underpin Cleomenes' measures has been much debated: for brief discussion and bibliography (and an overall position of prudent scepticism) see Paul Cartledge and Antony Spawforth, Hellenistic and Roman Sparta (edn.2, London & New York 2002) chap.4.