diff --git a/lib/symbols b/lib/symbols
index a812911158..65a6958dc0 100644
--- a/lib/symbols
+++ b/lib/symbols
@@ -87,6 +87,14 @@ smallmatrix       matrix      none
 vmatrix           matrix      none
 CD                matrix      none
 
+# split environments with optional valign argument.
+# the others (split and alignedat) are hardcoded.
+aligned           split       none
+gathered          split       none
+# from Morten H\o gholm's mathtools.sty:
+lgathered         split       none
+rgathered         split       none
+
 # references
 pageref           ref         none
 prettyref         ref         none
diff --git a/src/mathed/math_factory.C b/src/mathed/math_factory.C
index f3c5faf381..024d54cf04 100644
--- a/src/mathed/math_factory.C
+++ b/src/mathed/math_factory.C
@@ -276,6 +276,8 @@ MathAtom createMathInset(string const & s)
 			return MathAtom(new MathFontOldInset(l));
 		if (inset == "matrix")
 			return MathAtom(new MathAMSArrayInset(s));
+		if (inset == "split")
+			return MathAtom(new MathSplitInset(s));
 		return MathAtom(new MathSymbolInset(l));
 	}
 
diff --git a/src/mathed/math_parser.C b/src/mathed/math_parser.C
index 65b4f661ec..4d01de5f85 100644
--- a/src/mathed/math_parser.C
+++ b/src/mathed/math_parser.C
@@ -1178,6 +1178,18 @@ void Parser::parse1(MathGridInset & grid, unsigned flags,
 				if (l->inset == "matrix") {
 					cell->push_back(createMathInset(name));
 					parse2(cell->back(), FLAG_END, mode, false);
+				} else if (l->inset == "split") {
+					string const valign = parse_verbatim_option() + 'c';
+					cell->push_back(MathAtom(new MathSplitInset(name, valign[0])));
+					parse2(cell->back(), FLAG_END, mode, false);
+				} else {
+					dump();
+					lyxerr << "found math environment `" << name
+					       << "' in symbols file with unsupported inset `"
+					       << l->inset << "'." << endl;
+					// create generic environment inset
+					cell->push_back(MathAtom(new MathEnvInset(name)));
+					parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
 				}
 			}
 
diff --git a/src/mathed/math_splitinset.C b/src/mathed/math_splitinset.C
index 44938c79df..4f9005b774 100644
--- a/src/mathed/math_splitinset.C
+++ b/src/mathed/math_splitinset.C
@@ -109,6 +109,8 @@ void MathSplitInset::infoize(std::ostream & os) const
 
 void MathSplitInset::validate(LaTeXFeatures & features) const
 {
-	features.require("amsmath");
-	MathNestInset::validate(features);
+	if (name_ == "split" || name_ == "gathered" || name_ == "aligned" ||
+	    name_ == "alignedat")
+		features.require("amsmath");
+	MathGridInset::validate(features);
 }
diff --git a/status.14x b/status.14x
index 0fe422c492..d88d2ff636 100644
--- a/status.14x
+++ b/status.14x
@@ -36,6 +36,8 @@ What's new
 - Parse the optional argument of the AMS math environments aligned, gathered
   and alignedat.
 
+- Support lgathered and rgathered math environments.
+
 * User Interface:
 
 - Fix a crash that occured on exit if the clipboard was not empty (only on