Founding - 23rd Founding (Late 37th or Early 38th Millennium): The 23rd Founding (also known as the "Sentinel Founding") may have been one of a series of linked Foundings around this tumultuous period in Imperial history.It was intended to repair the power and reach of the Adeptus Astartes, which had suffered considerable losses in the preceding millennia.The Celestial Lions may also have been raised as a part of the Sentinel Founding, but this would then place the Founding in the early 38th Millennium.NameBadgeProgenitor ChapterLegion NumberStar Phantoms 	 	<a href="https://static.wikia.nocookie.net/warhammer40k/images/5/5d/Star_Phantoms_Livery.jpg/revision/latest?cb=20150831101944" class="image"><img alt="Star Phantoms Livery" src="https://static.wikia.nocookie.net/warhammer40k/images/5/5d/Star_Phantoms_Livery.jpg/revision/latest/scale-to-width-down/210?cb=20150831101944" decoding="async" loading="lazy" width="210" height="164" class="thumbimage" data-image-name="Star Phantoms Livery.jpg" data-image-key="Star_Phantoms_Livery.jpg" data-relevant="1" data-src="https://static.wikia.nocookie.net/warhammer40k/images/5/5d/Star_Phantoms_Livery.jpg/revision/latest/scale-to-width-down/210?cb=20150831101944" /></a> 	 		 			 		 		 		 	 Dark AngelsIMarines Errant 	 	<a href="https://static.wikia.nocookie.net/warhammer40k/images/e/ef/Marines_Errant_Livery.jpg/revision/latest?cb=20150903030510" class="image"><img alt="Marines Errant Livery" src="https://static.wikia.nocookie.net/warhammer40k/images/e/ef/Marines_Errant_Livery.jpg/revision/latest/scale-to-width-down/210?cb=20150903030510" decoding="async" loading="lazy" width="210" height="173" class="thumbimage" data-image-name="Marines Errant Livery.jpg" data-image-key="Marines_Errant_Livery.jpg" data-relevant="1" data-src="https://static.wikia.nocookie.net/warhammer40k/images/e/ef/Marines_Errant_Livery.jpg/revision/latest/scale-to-width-down/210?cb=20150903030510" /></a> 	 		 			 		 		 		 	 Eagle Warriors (Ultramarines Lineage)XIIIImperial Harbingers 	 	<a href="https://static.wikia.nocookie.net/warhammer40k/images/2/2f/Imperial_Harbingers_Shoulder_Plate.jpg/revision/latest?cb=20150829091832" class="image"><img alt="Imperial Harbingers Shoulder Plate" src="https://static.wikia.nocookie.net/warhammer40k/images/2/2f/Imperial_Harbingers_Shoulder_Plate.jpg/revision/latest/scale-to-width-down/210?cb=20150829091832" decoding="async" loading="lazy" width="210" height="177" class="thumbimage" data-image-name="Imperial Harbingers Shoulder Plate.jpg" data-image-key="Imperial_Harbingers_Shoulder_Plate.jpg" data-relevant="1" data-src="https://static.wikia.nocookie.net/warhammer40k/images/2/2f/Imperial_Harbingers_Shoulder_Plate.jpg/revision/latest/scale-to-width-down/210?cb=20150829091832" /></a> 	 		 			 		 		 		 	 UnknownUnknownSteel Cobras (Excommunicate Traitorus)Pict-File UnavailableUnknownUnknownCelestial Lions 	 	<a href="https://static.wikia.nocookie.net/warhammer40k/images/b/b5/Celestial_Lions_SP.jpg/revision/latest?cb=20240924201739" class="image"><img alt="Celestial Lions SP" src="https://static.wikia.nocookie.net/warhammer40k/images/b/b5/Celestial_Lions_SP.jpg/revision/latest/scale-to-width-down/210?cb=20240924201739" decoding="async" loading="lazy" width="210" height="178" class="thumbimage" data-image-name="Celestial Lions SP.jpg" data-image-key="Celestial_Lions_SP.jpg" data-relevant="1" data-src="https://static.wikia.nocookie.net/warhammer40k/images/b/b5/Celestial_Lions_SP.jpg/revision/latest/scale-to-width-down/210?cb=20240924201739" /></a> 	 		 			 		 		 		 	 Imperial FistsVII