Historical clue formulations

• El ___, mythical city of gold — 2026-04-07
• Mahi-mahi, by another name — 2018-10-06
• El ___ (fabled city) — 2014-04-09
• El ___ — 2001-01-21
• Fish also called mahimahi — 1996-12-22
• The Swordfish, to astronomers — 1995-03-05
• "El _____"('67 Wayne film) — 1994-03-18