Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Winthrop is the remnant of a lunarimpact crater that has been flooded by lava from the Oceanus Procellarum. It was named after American astronomer John Winthrop. It lies across the western rim of the much larger crater Letronne, a feature that has been nearly destroyed by the intruding mare lavas. All that survives of Winthrop are a few segments of the outer rim.
Winthrop was previously identified as Letronne P before being renamed by the IAU in 1976.
References
"Winthrop (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.
Menzel, D. H.; Minnaert, M.; Levin, B.; Dollfus, A.; Bell, B. (1971). "Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU". Space Science Reviews. 12 (2): 136–186. Bibcode:1971SSRv...12..136M. doi:10.1007/BF00171763. S2CID122125855.