What 'is' Price Charles's royal title surely you mean, and the Prince of Wales
Traditionally, the monarch's firstborn daughter receives the title of Princess Royal.
His Royal Highness the Duke of Cambridge
His Royal Highness the Duke of Cambridge
Her Royal Majesty
You should be able to obtain a reliable abstract of title within two weeks.
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What are Prince Charles's royal titles
She has no royal title (By her mother's decision) and while she holds an MBE, (Member of the British Empire) this does not confer a title upon the holder. So technically her title is 'Mrs' Zara Phillips.
The Royal Automobile Club was formed in 1897, and in 1907 was awarded the royal title by King Edward VII. When it was first formed, it was based around welcoming the automobile into society.
Lady
You obtain legal title by deed from the legal owner. A professional title examiner should be able to research the title and find a description in an old deed. See discussion page.