[1] Zenobius 3.6. For the phrase see e.g. Aristophanes, Birds 301 (Web address 1). It is customary (e.g. LSJ s.v. γλαύξ ; Dunbar ad loc.) to adduce the English saying "coals to Newcastle"; but non-UK readers should be warned that since the collapse of the once-proud English coal industry in the 1980s and 90s the modern phrase is now just as much of an historical curiosity as the ancient one. For Athens' owls see also gamma 282
[2] Unattested outside lexicography.