 And he was from other parts of Africa, South Sudan's two most powerful politicians gave assurances on Friday that they would not lead the country back into war as they marked its third birthday. And Pope Francis said he would visit if they did more to maintain a fragile peace. Valens exploded in South Sudan in late 2013, two years after it seceded from Sudan when President Selva Keir and ethnic dinkas sacked Vice President Ria Machar from the rival Noa group. The two men have signed several deals to end a war that fueled by longstanding ethnic tensions is estimated to have killed more than 400,000 people, finally forming a national unity government last year. Keir dissolved the parliament in May, paving the way for an expanded and more inclusive legislature of 550 members.