diff --git a/bimap/bimap.go b/bimap/bimap.go
index d992a39..94a5ba1 100644
--- a/bimap/bimap.go
+++ b/bimap/bimap.go
@@ -13,8 +13,15 @@ type BiMap struct {
 }
 
 // NewBiMap returns a an empty, mutable, biMap
-func NewBiMap() *BiMap {
-	return &BiMap{forward: make(map[interface{}]interface{}), inverse: make(map[interface{}]interface{}), immutable: false}
+func NewBiMap(content map[interface{}]interface{}) *BiMap {
+	b := &BiMap{forward: make(map[interface{}]interface{}), inverse: make(map[interface{}]interface{}), immutable: false}
+	if content != nil {
+		for k, v := range content {
+			b.Insert(k, v)
+		}
+	}
+
+	return b
 }
 
 // Insert puts a key and value into the BiMap, provided its mutable. Also creates the reverse mapping from value to key.
diff --git a/bimap/bimap_test.go b/bimap/bimap_test.go
index bbdebaa..893d9c9 100644
--- a/bimap/bimap_test.go
+++ b/bimap/bimap_test.go
@@ -67,7 +67,7 @@ func TestNewBiMap(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
 
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 	expected := &BiMap{forward: make(map[interface{}]interface{}), inverse: make(map[interface{}]interface{})}
 	t.Equals(expected, actual)
 }
@@ -75,7 +75,7 @@ func TestNewBiMap(tx *testing.T) {
 func TestBiMap_Insert(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 	actual.Insert(key, value)
 
 	fwdExpected := make(map[interface{}]interface{})
@@ -90,7 +90,7 @@ func TestBiMap_Insert(tx *testing.T) {
 func TestBiMap_Exists(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 
 	actual.Insert(key, value)
 	t.Assert(!actual.Exists("ARBITARY_KEY"), "Key should not exist")
@@ -100,7 +100,7 @@ func TestBiMap_Exists(tx *testing.T) {
 func TestBiMap_InverseExists(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 
 	actual.Insert(key, value)
 	t.Assert(!actual.ExistsInverse("ARBITARY_VALUE"), "Value should not exist")
@@ -110,7 +110,7 @@ func TestBiMap_InverseExists(tx *testing.T) {
 func TestBiMap_Get(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 
 	actual.Insert(key, value)
 
@@ -128,7 +128,7 @@ func TestBiMap_Get(tx *testing.T) {
 func TestBiMap_GetInverse(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 
 	actual.Insert(key, value)
 
@@ -146,7 +146,7 @@ func TestBiMap_GetInverse(tx *testing.T) {
 func TestBiMap_Size(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 
 	t.Equals(0, actual.Size())
 
@@ -158,7 +158,7 @@ func TestBiMap_Size(tx *testing.T) {
 func TestBiMap_Delete(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 	dummyKey := "DummyKey"
 	dummyVal := "DummyVal"
 	actual.Insert(key, value)
@@ -187,7 +187,7 @@ func TestBiMap_Delete(tx *testing.T) {
 func TestBiMap_InverseDelete(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 	dummyKey := "DummyKey"
 	dummyVal := "DummyVal"
 	actual.Insert(key, value)
@@ -216,7 +216,7 @@ func TestBiMap_InverseDelete(tx *testing.T) {
 func TestBiMap_WithVaryingType(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 	dummyKey := "Dummy key"
 	dummyVal := 3
 
@@ -232,7 +232,7 @@ func TestBiMap_WithVaryingType(tx *testing.T) {
 func TestBiMap_MakeImmutable(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 	dummyKey := "Dummy key"
 	dummyVal := 3
 
@@ -276,7 +276,7 @@ func TestBiMap_MakeImmutable(tx *testing.T) {
 func TestBiMap_GetForwardMap(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 	dummyKey := "Dummy key"
 	dummyVal := 42
 
@@ -293,7 +293,7 @@ func TestBiMap_GetForwardMap(tx *testing.T) {
 func TestBiMap_GetInverseMap(tx *testing.T) {
 	t := ut.BeginTest(tx, false)
 	defer t.FinishTest()
-	actual := NewBiMap()
+	actual := NewBiMap(nil)
 	dummyKey := "Dummy key"
 	dummyVal := 42
 
@@ -306,3 +306,25 @@ func TestBiMap_GetInverseMap(tx *testing.T) {
 	eq := reflect.DeepEqual(actualInverseMap, inverseMap)
 	t.Assert(eq, "Inverse maps should be equal")
 }
+
+func TestBiMap_Initialize(tx *testing.T) {
+	t := ut.BeginTest(tx, false)
+	defer t.FinishTest()
+
+	content := map[interface{}]interface{}{
+		"a": 1,
+		"b": 2,
+		"c": 3,
+	}
+
+	m := NewBiMap(content)
+
+	v, present := m.Get("a")
+	t.Equals(1, v)
+	t.Equals(true, present)
+
+	k, present := m.GetInverse(3)
+	t.Equals("c", k)
+	t.Equals(true, present)
+
+}