Mary Tamm as the first RomanaRomana, short for Romanadvoratrelundar, a Time Lady from the planet Gallifrey, she was a companion of The Doctor during his fourth incarnation.
Lalla Ward as the second, post-regeneration, RomanaThe White Guardian assigned her to be the Doctor's companion during the "Key to Time" storyline, and afterwards she stayed on until "Warriors' Gate".
Romana II animatedShe has appeared in countless spin-off material, many of which show her as the president of the Time Lords.
Other Appearances

Tom Baker and Lalla Ward appeared in a few 1980 Australian commercials for PR1ME Computers which ends with the Doctor proposing to Romana II.
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