diff --git a/ruma-identifiers-validation/src/device_key_id.rs b/ruma-identifiers-validation/src/device_key_id.rs
index a94c733c..5319143b 100644
--- a/ruma-identifiers-validation/src/device_key_id.rs
+++ b/ruma-identifiers-validation/src/device_key_id.rs
@@ -3,7 +3,7 @@ use std::{num::NonZeroU8, str::FromStr};
 use crate::{crypto_algorithms::DeviceKeyAlgorithm, Error};
 
 pub fn validate(s: &str) -> Result<NonZeroU8, Error> {
-    let colon_idx = NonZeroU8::new(s.find(':').ok_or(Error::MissingDeviceKeyDelimiter)? as u8)
+    let colon_idx = NonZeroU8::new(s.find(':').ok_or(Error::MissingDelimiter)? as u8)
         .ok_or(Error::UnknownKeyAlgorithm)?;
 
     DeviceKeyAlgorithm::from_str(&s[0..colon_idx.get() as usize])
diff --git a/ruma-identifiers-validation/src/error.rs b/ruma-identifiers-validation/src/error.rs
index 103817cb..e098d4b0 100644
--- a/ruma-identifiers-validation/src/error.rs
+++ b/ruma-identifiers-validation/src/error.rs
@@ -22,17 +22,12 @@ pub enum Error {
     /// The ID exceeds 255 bytes (or 32 codepoints for a room version ID).
     MaximumLengthExceeded,
 
-    /// The ID is missing the colon delimiter between localpart and server name.
+    /// The ID is missing the colon delimiter between localpart and server name, or between key
+    /// algorithm and key name / version.
     MissingDelimiter,
 
-    /// The ID is missing the colon delimiter between key algorithm and device ID.
-    MissingDeviceKeyDelimiter,
-
-    /// The ID is missing the colon delimiter between key algorithm and version.
-    MissingSigningKeyDelimiter,
-
     /// The ID is missing the correct leading sigil.
-    MissingSigil,
+    MissingLeadingSigil,
 
     /// The key algorithm is not recognized.
     UnknownKeyAlgorithm,
@@ -46,10 +41,8 @@ impl Display for Error {
             Error::InvalidKeyVersion => "key ID version contains invalid characters",
             Error::InvalidServerName => "server name is not a valid IP address or domain name",
             Error::MaximumLengthExceeded => "ID exceeds 255 bytes",
-            Error::MissingDelimiter => "colon is required between localpart and server name",
-            Error::MissingDeviceKeyDelimiter => "colon is required between algorithm and device ID",
-            Error::MissingSigningKeyDelimiter => "colon is required between algorithm and version",
-            Error::MissingSigil => "leading sigil is incorrect or missing",
+            Error::MissingDelimiter => "required colon is missing",
+            Error::MissingLeadingSigil => "leading sigil is incorrect or missing",
             Error::UnknownKeyAlgorithm => "unknown key algorithm specified",
         };
 
diff --git a/ruma-identifiers-validation/src/event_id.rs b/ruma-identifiers-validation/src/event_id.rs
index 6461b0d3..c9a8b69a 100644
--- a/ruma-identifiers-validation/src/event_id.rs
+++ b/ruma-identifiers-validation/src/event_id.rs
@@ -7,7 +7,7 @@ pub fn validate(s: &str) -> Result<Option<NonZeroU8>, Error> {
         true => Some(parse_id(s, &['$'])?),
         false => {
             if !s.starts_with('$') {
-                return Err(Error::MissingSigil);
+                return Err(Error::MissingLeadingSigil);
             }
 
             None
diff --git a/ruma-identifiers-validation/src/lib.rs b/ruma-identifiers-validation/src/lib.rs
index 80477ae1..226862be 100644
--- a/ruma-identifiers-validation/src/lib.rs
+++ b/ruma-identifiers-validation/src/lib.rs
@@ -24,7 +24,7 @@ fn validate_id(id: &str, valid_sigils: &[char]) -> Result<(), Error> {
     }
 
     if !id.starts_with(valid_sigils) {
-        return Err(Error::MissingSigil);
+        return Err(Error::MissingLeadingSigil);
     }
 
     Ok(())
diff --git a/ruma-identifiers-validation/src/signing_key_id.rs b/ruma-identifiers-validation/src/signing_key_id.rs
index d039266b..350f2fb4 100644
--- a/ruma-identifiers-validation/src/signing_key_id.rs
+++ b/ruma-identifiers-validation/src/signing_key_id.rs
@@ -3,7 +3,7 @@ use std::{num::NonZeroU8, str::FromStr};
 use crate::{crypto_algorithms::SigningKeyAlgorithm, Error};
 
 pub fn validate(s: &str) -> Result<NonZeroU8, Error> {
-    let colon_idx = NonZeroU8::new(s.find(':').ok_or(Error::MissingSigningKeyDelimiter)? as u8)
+    let colon_idx = NonZeroU8::new(s.find(':').ok_or(Error::MissingDelimiter)? as u8)
         .ok_or(Error::UnknownKeyAlgorithm)?;
 
     validate_signing_key_algorithm(&s[..colon_idx.get() as usize])?;
diff --git a/ruma-identifiers/CHANGELOG.md b/ruma-identifiers/CHANGELOG.md
index 86b186ae..321de2c8 100644
--- a/ruma-identifiers/CHANGELOG.md
+++ b/ruma-identifiers/CHANGELOG.md
@@ -7,6 +7,8 @@ Breaking changes:
 * Remove deprecated `is_` methods
 * Rename `ServerKeyAlgorithm` to `SigningKeyAlgorithm`
 * Rename `ServerKeyId` to `ServerSigningKeyId`
+* Rename `Error::MissingSigil` to `Error::MissingLeadingSigil`
+* Merge all missing delimiter error variants
 
 Improvements:
 
diff --git a/ruma-identifiers/src/device_key_id.rs b/ruma-identifiers/src/device_key_id.rs
index 8feafeeb..5208a92d 100644
--- a/ruma-identifiers/src/device_key_id.rs
+++ b/ruma-identifiers/src/device_key_id.rs
@@ -100,7 +100,7 @@ mod test {
     fn missing_delimiter() {
         assert_eq!(
             DeviceKeyId::try_from("ed25519|JLAFKJWSCS").unwrap_err(),
-            Error::MissingDeviceKeyDelimiter,
+            Error::MissingDelimiter,
         );
     }
 
diff --git a/ruma-identifiers/src/event_id.rs b/ruma-identifiers/src/event_id.rs
index 46856568..7469a9bd 100644
--- a/ruma-identifiers/src/event_id.rs
+++ b/ruma-identifiers/src/event_id.rs
@@ -243,14 +243,17 @@ mod tests {
 
     #[test]
     fn missing_original_event_id_sigil() {
-        assert_eq!(EventId::try_from("39hvsi03hlne:example.com").unwrap_err(), Error::MissingSigil);
+        assert_eq!(
+            EventId::try_from("39hvsi03hlne:example.com").unwrap_err(),
+            Error::MissingLeadingSigil
+        );
     }
 
     #[test]
     fn missing_base64_event_id_sigil() {
         assert_eq!(
             EventId::try_from("acR1l0raoZnm60CBwAVgqbZqoO/mYU81xysh1u7XcJk").unwrap_err(),
-            Error::MissingSigil
+            Error::MissingLeadingSigil
         );
     }
 
@@ -258,7 +261,7 @@ mod tests {
     fn missing_url_safe_base64_event_id_sigil() {
         assert_eq!(
             EventId::try_from("Rqnc-F-dvnEYJTyHq_iKxU2bZ1CI92-kuZq3a5lr5Zg").unwrap_err(),
-            Error::MissingSigil
+            Error::MissingLeadingSigil
         );
     }
 
diff --git a/ruma-identifiers/src/room_alias_id.rs b/ruma-identifiers/src/room_alias_id.rs
index 28f39b9f..bfbe6da9 100644
--- a/ruma-identifiers/src/room_alias_id.rs
+++ b/ruma-identifiers/src/room_alias_id.rs
@@ -134,7 +134,7 @@ mod tests {
     fn missing_room_alias_id_sigil() {
         assert_eq!(
             RoomAliasId::try_from("39hvsi03hlne:example.com").unwrap_err(),
-            Error::MissingSigil
+            Error::MissingLeadingSigil
         );
     }
 
@@ -145,7 +145,10 @@ mod tests {
 
     #[test]
     fn invalid_leading_sigil() {
-        assert_eq!(RoomAliasId::try_from("!room_id:foo.bar").unwrap_err(), Error::MissingSigil);
+        assert_eq!(
+            RoomAliasId::try_from("!room_id:foo.bar").unwrap_err(),
+            Error::MissingLeadingSigil
+        );
     }
 
     #[test]
diff --git a/ruma-identifiers/src/room_id.rs b/ruma-identifiers/src/room_id.rs
index f79b63d3..9fd856ab 100644
--- a/ruma-identifiers/src/room_id.rs
+++ b/ruma-identifiers/src/room_id.rs
@@ -150,7 +150,7 @@ mod tests {
 
     #[test]
     fn missing_room_id_sigil() {
-        assert_eq!(RoomId::try_from("carl:example.com").unwrap_err(), Error::MissingSigil);
+        assert_eq!(RoomId::try_from("carl:example.com").unwrap_err(), Error::MissingLeadingSigil);
     }
 
     #[test]
diff --git a/ruma-identifiers/src/room_id_or_room_alias_id.rs b/ruma-identifiers/src/room_id_or_room_alias_id.rs
index 05f13ce6..7283951c 100644
--- a/ruma-identifiers/src/room_id_or_room_alias_id.rs
+++ b/ruma-identifiers/src/room_id_or_room_alias_id.rs
@@ -166,7 +166,10 @@ mod tests {
 
     #[test]
     fn missing_sigil_for_room_id_or_alias_id() {
-        assert_eq!(RoomIdOrAliasId::try_from("ruma:example.com").unwrap_err(), Error::MissingSigil);
+        assert_eq!(
+            RoomIdOrAliasId::try_from("ruma:example.com").unwrap_err(),
+            Error::MissingLeadingSigil
+        );
     }
 
     #[cfg(feature = "serde")]
diff --git a/ruma-identifiers/src/signing_key_id.rs b/ruma-identifiers/src/signing_key_id.rs
index 9319fac0..174d7f3a 100644
--- a/ruma-identifiers/src/signing_key_id.rs
+++ b/ruma-identifiers/src/signing_key_id.rs
@@ -97,7 +97,7 @@ mod tests {
     fn missing_delimiter() {
         assert_eq!(
             ServerSigningKeyId::try_from("ed25519|Abc_1").unwrap_err(),
-            Error::MissingSigningKeyDelimiter,
+            Error::MissingDelimiter,
         );
     }
 }
diff --git a/ruma-identifiers/src/user_id.rs b/ruma-identifiers/src/user_id.rs
index fd10739a..23a04d2b 100644
--- a/ruma-identifiers/src/user_id.rs
+++ b/ruma-identifiers/src/user_id.rs
@@ -239,7 +239,7 @@ mod tests {
 
     #[test]
     fn missing_user_id_sigil() {
-        assert_eq!(UserId::try_from("carl:example.com").unwrap_err(), Error::MissingSigil);
+        assert_eq!(UserId::try_from("carl:example.com").unwrap_err(), Error::MissingLeadingSigil);
     }
 
     #[test]