The alleged stalker, named as Alysson Billings, who has never met Plant, reportedly believes that she is in a relationship with the Led Zeppelin legend, according to The Sun.

Billings had reportedly turned up at his concerts worldwide and left him hotel keys as well as sending him flowers and packages but things apparently grew worse once Plant became involved with folk singer Patty Griffin.

Billings allegedly sent Plant a slew of threatening messages, according to gossip site TMZ. One message said, "Your betrayal with another woman still stabs my mind."