
1) Ancient Greek architect 2) Impact crater on Mercury
Found on
https://www.crosswordclues.com/clue/ictinus

Ictinus (Ἰκτῖνος, Iktinos) was an architect active in the mid 5th century BC. Ancient sources identify Ictinus and Callicrates as co-architects of the Parthenon. Pausanias identifies Ictinus as architect of the Temple of Apollo at Bassae. That temple was Doric on the exterior, Ionic on the interior, and incorporated a Corinthian column, t...
Found on
http://en.wikipedia.org/wiki/Ictinus
[crater] Ictinus is a crater on Mercury. It has a diameter of 119 kilometers. Its name was adopted by the International Astronomical Union in 1976. Ictinus is named for the Ancient Greek architect Ictinus, who lived in the 5th century BCE. ...
Found on
http://en.wikipedia.org/wiki/Ictinus_(crater)

fl. mid-5th century b.c., Greek architect, a designer of the Parthenon.
Found on
https://www.infoplease.com/dictionary/ictinus
No exact match found.