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[[File:Castle of the Two Sisters S4E03.png|thumb|300px|Celestia and Luna's old castle in the Everfree Forest.]] The '''Castle of the Two Sisters''', also known as the '''Castle of the Royal Pony Sisters''', is the castle that [[Princess Celestia]] and [[Princess Luna]] used to live in a thousand years prior to the beginning of [[My Little Pony Friendship is Magic|the series]]. It is located deep within the [[Everfree Forest]] and, according to ''[[The Journal of the Two Sisters]]'', was built by the princesses, [[List of non-pony characters#Melvin|Melvin]] the [[Creatures#Manticore|manticore]], and [[Star Swirl the Bearded]]. It now stands abandoned and dilapidated, as much of it was destroyed during the battle between Celestia and [[Princess Luna#Nightmare Moon|Nightmare Moon]].

==Depiction in the series==
===Season one===
[[File:Castle of the Royal Pony Sisters in the distance S1E02.png|thumb|left|The castle in ruins.]] The castle is first introduced in the [[Friendship is Magic, part 2|second part]] of the [[Friendship is Magic, part 1|season one premiere]], mentioned in the book ''The Elements of Harmony: A Reference Guide''. It specifies that the last known location of the [[Elements of Harmony]] is in the ancient castle of the royal pony sisters, and that the castle itself is located in what is now known as the [[Everfree Forest]]. [[Twilight Sparkle]] and her friends travel to the castle in order to retrieve the Elements and defeat [[Princess Luna#Nightmare Moon|Nightmare Moon]].

In this episode, only two rooms in the castle are featured: the foyer, where the Elements of Harmony are found, and the throne room, where Twilight and her friends defeat Nightmare Moon.

===Season four===
[[File:Twilight in old pony sisters' castle S4E01.png|thumb|The ancient castle, a thousand years ago.]] In the season four premiere, [[Princess Twilight Sparkle - Part 1]], Twilight views a flashback in which the castle is in its prime. Unlike in Friendship is Magic, part 2, the throne room has two thrones instead of one. Within the flashback, Twilight witnesses [[Princess Luna]] destroy parts of the throne room and her transformation into Nightmare Moon.

In [[Princess Twilight Sparkle - Part 2]], Nightmare Moon attacks [[Princess Celestia]], destroying more of the throne room and much of the castle's surrounding architecture in the process. The Elements of Harmony are also shown, when Princess Celestia raises them up from a chamber underneath the throne room floor.

The castle and its inner workings are featured in greater detail in [[Castle Mane-ia]] when Twilight and her friends all find their way to the old castle for varying reasons. The first new room in the castle to be shown is the library, which houses an abundance of ancient books and a large stone [[Alicorns|Alicorn]] bust. [[Creatures#Star spider|Star spiders]] have also taken up residence in the library.

The castle is shown to be filled with numerous secret doors and traps, some of which Twilight's friends inadvertently set off and get themselves trapped in and most of which are controlled by a large pipe organ in the castle basement. Other rooms and areas in the castle include the "Hall of Hooves"—a hallway lined with torch wall-mounts shaped like pony legs—a corridor lined with suits of pony armor, and a basement chamber that houses the aforementioned "Organ to the Outside". External shots of the castle show dragon statues on its ledges.

[[File:Reading room in library S4E03.png|thumb|left|The royal sisters' personal reading room.]] One significant room discovered by Twilight, with the assistance of [[Spike]] and [[Angel]], is a personal reading room for the royal sisters off the main library behind a secret door. This small chamber has a small reading couch and some throw pillows. The room also features a raised reading stand upon which rests the personal journal of Princess Celestia and Princess Luna from the time before Luna's fall to become Nightmare Moon. Illumination to the room is through two intact stained glass windows, a blue one depicting Luna's moon and a yellow one depicting Celestia's sun.

Despite having evidently been abandoned after Nightmare Moon's defeat, the castle remains in surprisingly good condition. The books in the library, despite being over a thousand years old, all appear in a usable condition, the various traps and pitfalls work smoothly, and the Organ to the Outside is in good working order and remains in tune. Even a small trapdoor that delivers food to Luna and Celestia's personal reading room appears to somehow still have access to fresh produce.

In the time following the castle's abandonment, it has also become the subject of Equestrian urban legends, such as the [[Pony of Shadows]], an ethereal being said to have formed from remnants of Nightmare Moon's [[magic]].

[[File:A hidden stairway in the Castle of the Royal Pony Sisters, S4E22.png|thumb|Spike retrieves a spell in a hidden stairway.]] In [[Power Ponies]], Twilight and her friends are seen tidying the castle up.

Spike retrieves the ''Inspiration Manifestation'' spell from a hidden trapped chamber in the castle's library in the [[Inspiration Manifestation|episode of the same name]].

Twilight and her friends appear in the castle again in [[Twilight's Kingdom - Part 1]] in order to figure how to unlock the [[Chest of Harmony|Tree of Harmony chest]].{{clr}}

===Season five===
[[File:Castle of the Two Sisters S5E26.png|thumb|left|The castle in an alternate timeline.]]
The castle appears in Princess Luna's dream in [[Do Princesses Dream of Magic Sheep?]] when she dreams of becoming Nightmare Moon again.

In [[The Cutie Re-Mark - Part 2]], the castle appears in an alternate timeline in pristine condition, serving as Nightmare Moon's castle home. The castle's design in the episode is partially based on artwork shown both in ''[[The Art of Equestria]]'' and in a [[:File:The Mane Six at a castle.jpg|background image]] featured on Hubworld.com.

===Season seven===
In [[Shadow Play - Part 2]], the castle briefly appears in its original state during a flashback in which [[Stygian]] transformed into the Pony of Shadows and confronted [[Star Swirl the Bearded|Star Swirl]] and the Pillars of Old Equestria.

===Season eight===
In [[School Daze - Part 2]], [[School of Friendship]] students [[Ocellus]], [[Smolder]], [[Yona]], [[Sandbar]], [[Gallus]], and [[Silverstream]] hide out at the castle, but get attacked by [[Creatures#Puckwudgie|puckwudgies]]. Twilight and her friends arrive just in time to save them, and expel the puckwudgies from the ruins.

=== Season nine ===
In [[Uprooted]], the restored [[Tree of Harmony]] grows up through the center of the castle ruins. The ruins also appear in [[She's All Yak]] and [[Student Counsel]].

==Depiction in books==
{{Expand}}
The castle appears in ''[[List of storybooks#English|Friendship is Magic]]'', as in [[Friendship is Magic, part 2|the second]] of the two episodes adapted;<ref>{{cite web|url=http://mlparena.com/archive/Forums/viewtopic/p=3135115.html#3135115|title=Friendship is Magic storybook scans|accessdate=2014-06-11}}</ref> is featured in ''[[Rainbow Dash and the Daring Do Double Dare]]'', in which the '''Dual Stronghold''' is code for the Castle of the Two Sisters; serves as a secret meeting point of the Mane 6 in ''[[Rarity and the Curious Case of Charity]]''; and is detailed in ''[[The Journal of the Two Sisters]]'', including the construction of the Castle of the Two Sisters.

In the [[IDW comics]]' [[Reflections]] story arc, the Castle of the Two Sisters still stands in an [[Equestria (Reflections storyline)|alternate universe]] of [[Equestria]]. In {{comic|v1}}, the original Castle of Two Sisters is shown visited by [[Radiant Hope]] in the past on page 21 and is mentioned on page 22. In {{comic|f16}}, the castle is visited by the [[Cutie Mark Crusaders]]. In {{comic|f35}}, Twilight and [[Starlight Glimmer]] travel to the castle to "tidy up the library" only to end up in a competition. In {{comic|l12}}, Star Swirl joins the other Pillars of Old Equestria and Stygian at the castle before setting out to face [[the Dazzlings]]. In {{comic|70}}, it serves as the final location in Rainbow Dash's game of "extreme bingo". In {{scomic|71}}, "Twilight's new students experience Nightmare Night in Ponyville for the first time" and "wander into a very haunted Castle of the Two Sisters".<ref>{{cite web|url=https://www.bleedingcool.com/2018/07/25/idw-october-solicitations-2018-disney-afternoon-giant-darth-vader-castle-star-wars/|title=From Disney’s Afternoon Giant to Darth Vader’s Castle – IDW October Solicits 2018|author=Rich Johnston|publisher=Bleeding Cool|date=2018-07-25|accessdate=2018-07-25}}</ref>

==Gallery==
{{Gallery page|Twilight and Spike walking inside the castle S4E03.png}}

==References==
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{{Locations}}
[[de:Schloss der Ponyschwestern]]
[[es:Castillo de las Dos Hermanas]]
[[pt:Castelo Real das Duas Irmãs]]
[[ru:Замок королевских сестёр]]
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