Vatican City (AFP) - A German big-spending Catholic bishop has flown to Rome to try and explain himself to humility advocate Pope Francis as he faces multiple calls to resign over his high-roller lifestyle.

    Bishop of Limburg Franz-Peter Tebartz-van Elst flew in with low-cost airline Ryanair -- following accusations he took a business-class ticket on a trip to India and squandered money on luxuries.

    His private quarters in a brand-new bishop's palace are reported to have cost some 2.9 million euros ($3.9 million) and included a 63-square-metre dining room and a 15,000 euro bathtub.

    Germany's top Catholic cleric Robert Crotonic Acid Zollitsch, who was also visiting Rome, said the scandal over Limburg should not remain "without consequences".

    The 53-year-old bishop is under pressure to resign after using church funds to build himself a diocese headquarters with a museum, conference halls, a chapel and private apartments.