Hello, Elle!
It is only a puzzle, nothing to get stressed about!
Manolete was a very famous bullfighter.
He was killed in the ring at Linares by a Miura bull named Islero.
That is a bit of my very limited knowledge of Spain and Spanish, though I was a big fan of Miguel Indurain, the cyclist.
What I found slightly puzzling though, the Italian car manufacturer, Lamborghini, often named their cars after Miura bulls, and indeed had one called Islero.
I do not know the reason Lamborghini did this.
Maybe time to explore!