Answer the following Q with stream of consciousness. Context: Real Madrid hold the record for the most overall titles, with 22 followed by Milan's 17 titles. Spanish teams hold the record for the most wins in each of the three main UEFA club competitions: Real Madrid, with thirteen European Cup / UEFA Champions League titles; Sevilla, with five UEFA Cup / UEFA Europa League titles; and Barcelona, with four Cup Winners' Cup titles. Milan share the most Super Cup wins (five) with Barcelona, and the most Intercontinental Cup wins (three) with Real Madrid. German clubs Hamburg, Schalke 04 and Stuttgart, and Spanish club Villarreal are the record holders by titles won in the UEFA Intertoto Cup (twice each).

Question: who have won the champions league the most?
The relevant sentence in the passage is: Spanish teams hold the record for the most wins in each of the three main UEFA club competitions: Real Madrid, with thirteen European Cup / UEFA Champions League titles; Sevilla, with five UEFA Cup / UEFA Europa League titles; and Barcelona, with four Cup Winners' Cup titles. Therefore, the final answer is Real Madrid.