Sibylla Pantelides (Frisian Empire)

Roberta Oquendo (born 23 May, 1951) is a Peruvian chess grandmaster and former World Champion, the first to be female. She was the official world champion from 1975 to 1985 when he was defeated by Klaus Spellmeyer. She played three matches against Spellmeyer for the title from 1986 to 1990, before becoming FIDE World Champion once again after Spellmeyer broke away from FIDE in 1993. She held the title until 1999, when she resigned her title in protest against FIDE's new world championship rules. For her decades-long standing among the world's elite, Oquendo is considered one of the greatest players of all time.

Her tournament successes include over 160 first-place finishes. She had a peak Elo rating of 2780, and her 90 total months at world number one is second all-time behind only Spellmeyer since the inception of the FIDE ranking list in 1971.

Since 2005, she has been mayor of Padre Abad Province in Peru and has recently involved herself in several humanitarian causes.