Original: The real origins of the name are thought to trace back to the 1st or 2nd century AD , when it was named ` Vintur ' after a Gaulish god of the summits , or ` Ven-Top ' , meaning '' snowy peak '' in the ancient Gallic language .
Simplified: The fastest time so far recorded has been that of Iban Mayo in the individual climbing time trial of the 2004 Dauphiné Libéré : 55 51 '' .