Honoré V was Prince of Monaco and Duke of Valentinois. He was born Honoré Gabriel Grimaldi, the first son of Honoré IV of Monaco and Louise d'Aumont.
Gustave Saige describes him as a loner who did not trust anyone, let alone his brother, to help him govern. He was invisible to the public. For a monarch to be invisible to an increasingly restless public was an unfortunate circumstance, to say the least. In fairness, his focus had to be the crippled economy of Monaco. He raised taxes and tried to restore the tobacco plant his grandfather Honoré III had founded but which had been closed by the government of Turin. He earnestly endeavored to open factories and initiate citrus farm cooperatives in order put people to work, generate production, and alleviate poverty. However, none of his efforts raised his popularity, as his measures were seen by the people as autocratic.
Although Honoré V never married, he did have a son. Louis Gabriel Oscar Grimaldi was born in Paris on 9 June 1814 and died in Saint-Germain-en-Laye on 15 July 1894.
Louis Gabriel Oscar Grimaldi was legitimized; however it was Honoré's younger brother, Prince Florestan, who succeeded him.