Please answer a question about the following article about John, King of England:

When John's elder brother Richard became king in September 1189, he had already declared his intention of joining the Third Crusade. Richard set about raising the huge sums of money required for this expedition through the sale of lands, titles and appointments, and attempted to ensure that he would not face a revolt while away from his empire. John was made Count of Mortain, was married to the wealthy Isabel of Gloucester, and was given valuable lands in Lancaster and the counties of Cornwall, Derby, Devon, Dorset, Nottingham and Somerset, all with the aim of buying his loyalty to Richard whilst the king was on crusade. Richard retained royal control of key castles in these counties, thereby preventing John from accumulating too much military and political power, and, for the time being, the king named the four-year-old Arthur of Brittany as the heir to the throne. In return, John promised not to visit England for the next three years, thereby in theory giving Richard adequate time to conduct a successful crusade and return from the Levant without fear of John seizing power. Richard left political authority in England – the post of justiciar – jointly in the hands of Bishop Hugh de Puiset and William Mandeville, and made William Longchamp, the Bishop of Ely, his chancellor. Mandeville immediately died, and Longchamp took over as joint justiciar with Puiset, which would prove to be a less than satisfactory partnership. Eleanor, the queen mother, convinced Richard to allow John into England in his absence.

Who convinced Richard to allow John to join into England?
Eleanor