Antoinette de Mérode
Antoinette de Merode (Antoinette Ghislaine; 28 September 1828 – 10 February 1864), was the Princess of Monaco by marriage to Charles III, Prince of Monaco.
Chevalier de Grimaldi
Antoine Grimaldi, le Chevalier [de] Grimaldi, (Paris, 2 October 1697 – Monaco, 28 November 1784) was the de facto ruler of Monaco between 1732 and 1784.
An illegitimate son of Antonio I of Monaco and the dancer Élisabeth Dufort (named "Babé"), he was recognized by his father in 1715.
The Chevalier de Grimaldi became governor-general of Monaco on 20 May 1732, when his brother-in-law Jacques I, Prince of Monaco and his young nephew Honoré III, Prince of Monaco moved to Hôtel Matignon in Paris and remained there, even after the proclamation in 1734 of Honoré as Prince of Monaco.
This situation remained the same for half a century until Antoine's death in 1784, when Honoré III was already 64 years old.
Antoine Grimaldi was an able regent.
For example, he succeeded in keeping Monaco out of the War of the Austrian Succession (1740–1748).
He never married and died on 28 November 1784.
His remains were moved in 1966 to the Apse of the Monaco Cathedral.
Maria Caterina Brignole
Maria Caterina Brignole( or Marie- Christine de Brignole; 7 October 1737 – 18 March 1813) was Princess consort of Monaco by marriage to Honoré III, Prince of Monaco.
Her husband died in 1795, and in 1798 she married Louis Joseph de Bourbon, Prince de Condé.
Princess Charlotte, Duchess of Valentinois
Princess Charlotte of Monaco, Duchess of Valentinois( Charlotte Louise Juliette Grimaldi; 30 September 1898 – 15 November 1977), was the daughter of Louis II, Prince of Monaco, and the mother of Rainier III, Prince of Monaco.
From 1922 until 1944, she was the Hereditary Princess of Monaco, heir presumptive to the throne.
Princess Stéphanie of Monaco
Princess Stéphanie of Monaco, Countess of Polignac( Stéphanie Marie Elisabeth Grimaldi; born 1 February 1965) is the youngest child of Rainier III, Prince of Monaco, and the American actress Grace Kelly.
She is the younger sister of Albert II, Prince of Monaco, and Caroline, Princess of Hanover.
Currently 14th in the line of succession to the Monegasque throne, she has been a singer, swimwear designer and fashion model.
Otto III, Prince of Anhalt-Bernburg
Otto III, Prince of Anhalt- Bernburg( died 27 February 1404) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Bernburg.
He was the youngest son of Bernhard III, Prince of Anhalt- Bernburg, by his third wife Matilda, daughter of Magnus I, Duke of Brunswick- Göttingen.
Pauline Ducruet
Pauline Grace Maguy Ducruet( born 4 May 1994) is the elder daughter of Princess Stéphanie of Monaco.
Her maternal grandparents were Rainier III, Prince of Monaco, and American actress Grace Kelly.
She is the niece of Prince Albert II.
Ducruet is currently 16th in the line of succession to the Monegasque throne.
Maria Caroline Gibert de Lametz
Marie Caroline Gibert de Lametz, (18 July 1793 – 25 November 1879), was a French stage actress and a Princess Consort and regent de facto of Monaco by marriage to Florestan I, Prince of Monaco.
Louis Ducruet
Louis Robert Paul Ducruet( born 26 November 1992) is the son of Princess Stéphanie of Monaco and Daniel Ducruet.
Although he holds no title, he is a grandson of Rainier III, Prince of Monaco, and American actress Grace Kelly.
As nephew of Prince Albert II, he is currently 15th in the line of succession to the Monegasque throne.
Charles III, Prince of Monaco
Charles III (8 December 1818 – 10 September 1889) was Prince of Monaco and Duke of Valentinois from 20 June 1856 to his death.
He was the founder of the famous casino in Monte Carlo, as his title in Monegasque and Italian was Carlo III.
He was born in Paris Charles Honoré Grimaldi, the only son of Florestan I of Monaco and Maria Caroline Gibert de Lametz.

Question: When is Charles Iii, Prince Of Monaco's mother's birthday?
Answer: 18 July 1793