Hicham El Guerrouj won the 1,500 metres event at IAAF Golden League Golden Gala in Rome, Italy, in a time of 3 minutes 26 seconds on 14 July 1998.
He beat the existing record by more than a second.
El Guerrouj also retained 4 other world record times:
over one mile (indoors and outdoors) 2,000 metres (outdoors) and 1,500 metres (indoors) as on 2017
Record: Guinness World Record
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Morocco