Here's why:
* Queen Elizabeth I: While many actresses have portrayed her on screen, including Cate Blanchett, Judi Dench, and Helen Mirren, none have won an Oscar specifically for that role.
* Queen Elizabeth II: There have been several actresses who have portrayed the current Queen, but none have won an Oscar for their performances.
It's worth noting that Helen Mirren did win an Oscar for Best Actress in 2007 for her role as Queen Elizabeth II in the film "The Queen." However, the film focused on a specific period in the Queen's life, during the aftermath of Princess Diana's death.