Valmiki Ramayana 2.110.28

शङ्खणस्य च पुत्रो ऽभूच्छूर: श्रीमान् सुदर्शन: ।सुदर्शनस्याग्निवर्ण अग्निवर्णस्य शीघ्रग:॥

śaṅkhaṇasya ca putro 'bhūcchūra: śrīmān sudarśana: |sudarśanasyāgnivarṇa agnivarṇasya śīghraga: ||

Our plain-language meaning of this verse is waiting for scholar review.