Table schema:
CREATE TABLE table_name_65 (count_palatine_of_the_rhine VARCHAR, interregnum_began VARCHAR)

Question: What is the name of the Count Palatine of the Rhine with a Interregnum began of 2 april 1657 death of ferdinand iii?
SQL: SELECT count_palatine_of_the_rhine FROM table_name_65 WHERE interregnum_began = "2 april 1657 death of ferdinand iii"