A prosthetic assembly configured for endovascular placement within an aortic arch, the prosthetic assembly comprising: a proximal aortic stent-graft prosthesis including a tubular graft and at least one stent coupled to the tubular graft, wherein the proximal aortic stent-graft prosthesis also includes a coupling extending from the tubular graft, the coupling being configured to be positioned proximal to an ostium of a first branch vessel when deployed in situ; a distal aortic stent-graft prosthesis including a tubular graft and at least one stent coupled to the tubular graft, wherein the distal aortic stent-graft prosthesis also includes a coupling extending from the tubular graft; a first branch stent-graft prosthesis including a tubular graft and at least one stent coupled to the tubular graft, wherein the first branch stent-graft prosthesis is configured to be disposed through the coupling of the proximal aortic stent-graft prosthesis when the proximal aortic stent-graft prosthesis and the first branch stent-graft prosthesis are each in an expanded configuration; and a second branch stent-graft prosthesis including a tubular graft and at least one stent coupled to the tubular graft, wherein the second branch stent-graft prosthesis is configured to be disposed through the coupling of the distal aortic stent-graft prosthesis when the distal aortic stent-graft prosthesis and the second branch stent-graft prosthesis are each in an expanded configuration, and wherein a proximal end of the distal aortic stent-graft prosthesis is configured to be disposed within a distal end of the proximal aortic stent-graft prosthesis to form an overlap between the proximal and distal aortic stent-graft prostheses when the proximal and distal aortic stent-graft prostheses are in their respective expanded configurations, the overlap being relatively increased due to the coupling of the proximal aortic stent-graft prosthesis being positioned proximal to the ostium of the first branch vessel in situ. a proximal aortic stent-graft prosthesis including a tubular graft and at least one stent coupled to the tubular graft, wherein the proximal aortic stent-graft prosthesis also includes a coupling extending from the tubular graft, the coupling being configured to be positioned proximal to an ostium of a first branch vessel when deployed in situ; a distal aortic stent-graft prosthesis including a tubular graft and at least one stent coupled to the tubular graft, wherein the distal aortic stent-graft prosthesis also includes a coupling extending from the tubular graft; a first branch stent-graft prosthesis including a tubular graft and at least one stent coupled to the tubular graft, wherein the first branch stent-graft prosthesis is configured to be disposed through the coupling of the proximal aortic stent-graft prosthesis when the proximal aortic stent-graft prosthesis and the first branch stent-graft prosthesis are each in an expanded configuration; and a second branch stent-graft prosthesis including a tubular graft and at least one stent coupled to the tubular graft, wherein the second branch stent-graft prosthesis is configured to be disposed through the coupling of the distal aortic stent-graft prosthesis when the distal aortic stent-graft prosthesis and the second branch stent-graft prosthesis are each in an expanded configuration, and wherein a proximal end of the distal aortic stent-graft prosthesis is configured to be disposed within a distal end of the proximal aortic stent-graft prosthesis to form an overlap between the proximal and distal aortic stent-graft prostheses when the proximal and distal aortic stent-graft prostheses are in their respective expanded configurations, the overlap being relatively increased due to the coupling of the proximal aortic stent-graft prosthesis being positioned proximal to the ostium of the first branch vessel in situ.