"Reign" Season 4 has been reported to be the last installment of the hit historical TV drama. Now that the show is near its end, a couple of updates have surfaced online regarding this season's plot. So here are five interesting spoilers that fans should know before "Reign" Season 4 airs this week.

First, "Reign" Season 4 spoilers claimed that the two Queens will fight to preserve their reign as per International Business Times. There should only be a single queen left to rule England so it remains to be seen who among Queen Mary and Queen Elizabeth could take the throne in the series finale. However, if history is to be considered, then fans should know by now how Mary's fate will unfold.

"Reign" Season 4 spoilers also stated that Mary, in her hopes to claim the English kingdom, is going to marry Lord Darnley. Actor Will Kemp will be the one to give life to the new character. He is Mary's second husband and the couple would bear a child.

Apart from a new cast, "Reign" Season 4 spoilers revealed that this season will feature Mary's son. She will give birth to a boy who is going to be the future King James. The episodes will also see the Queen as she spends time with her newborn and portrays the role of a mother.

Lastly, fans would discover who among the characters would go insane this season. As per "Reign" Season 4 spoilers, one character will lose sanity and become crazy, MobilenApps reported. Do you have any guesses who he/she could be?

"Reign" Season 4 air date is set on Feb. 10. Don't forget to watch the first episode on The CW. In the meantime, check out the newly released promo below and tell us what you think of the new season in our comments section.