Cameca

Cameca was an elderly female Aztec in the 15th century.

Biography
The First Doctor unwittingly proposed to Cameca when he shared cocoa with her. She later helped the Doctor and his companions find the secret entrance to the temple, despite knowing that it would allow her beloved to leave her. She gave the Doctor her brooch before they parted ways, which he took with him as he entered the TARDIS. (DW: The Aztecs)

Behind the scenes

 * Cameca was the first human female the Doctor expressed romantic affection for, something he would not display again until his Eighth, Ninth, and Tenth incarnations.
 * Margot VanDerberg, the actress playing Cameca, was much younger than the character was inteded to be. She was in her early thirties at the time she played the role. Her character's intended age was accomplished with makeup and speaking in a lower voice.