interregnum began                          interregnum ended             duration                    count palatine of saxony            count palatine of the rhine
0     9 december 1437 death of sigismund        18 march 1438 election of albert ii    3 months , 9 days            frederick ii , elector of saxony            louis iv , elector palatine
1     27 october 1439 death of albert ii  2 february 1440 election of frederick iii    3 months , 6 days            frederick ii , elector of saxony            louis iv , elector palatine
2  12 january 1519 death of maximilian i         17 june 1519 election of charles v    5 months , 5 days           frederick iii , elector of saxony             louis v , elector palatine
3    20 january 1612 death of rudolph ii          13 june 1612 election of matthias   4 months , 24 days           john george i , elector of saxony         frederick v , elector palatine
4        20 march 1619 death of matthias    28 august 1619 election of ferdinand ii    5 months , 8 days           john george i , elector of saxony         frederick v , elector palatine
5    2 april 1657 death of ferdinand iii         18 july 1658 election of leopold i  15 months , 16 days          john george ii , elector of saxony   ferdinand maria , elector of bavaria
6        17 april 1711 death of joseph i     12 october 1711 election of charles vi   5 months , 25 days    frederick augustus i , elector of saxony        john william , elector palatine
7    20 october 1740 death of charles vi    14 january 1742 election of charles vii  14 months , 25 days   frederick augustus ii , elector of saxony    charles albert , elector of bavaria
8   20 january 1745 death of charles vii    13 september 1745 election of francis i   7 months , 24 days   frederick augustus ii , elector of saxony    maximilian iii , elector of bavaria
9    20 february 1790 death of joseph ii   30 september 1790 election of leopold ii   7 months , 10 days  frederick augustus iii , elector of saxony  charles theodore , elector of bavaria

Table as JSON:
{"interregnum began":{"0":"9 december 1437 death of sigismund","1":"27 october 1439 death of albert ii","2":"12 january 1519 death of maximilian i","3":"20 january 1612 death of rudolph ii","4":"20 march 1619 death of matthias","5":"2 april 1657 death of ferdinand iii","6":"17 april 1711 death of joseph i","7":"20 october 1740 death of charles vi","8":"20 january 1745 death of charles vii","9":"20 february 1790 death of joseph ii"},"interregnum ended":{"0":"18 march 1438 election of albert ii","1":"2 february 1440 election of frederick iii","2":"17 june 1519 election of charles v","3":"13 june 1612 election of matthias","4":"28 august 1619 election of ferdinand ii","5":"18 july 1658 election of leopold i","6":"12 october 1711 election of charles vi","7":"14 january 1742 election of charles vii","8":"13 september 1745 election of francis i","9":"30 september 1790 election of leopold ii"},"duration":{"0":"3 months , 9 days","1":"3 months , 6 days","2":"5 months , 5 days","3":"4 months , 24 days","4":"5 months , 8 days","5":"15 months , 16 days","6":"5 months , 25 days","7":"14 months , 25 days","8":"7 months , 24 days","9":"7 months , 10 days"},"count palatine of saxony":{"0":"frederick ii , elector of saxony","1":"frederick ii , elector of saxony","2":"frederick iii , elector of saxony","3":"john george i , elector of saxony","4":"john george i , elector of saxony","5":"john george ii , elector of saxony","6":"frederick augustus i , elector of saxony","7":"frederick augustus ii , elector of saxony","8":"frederick augustus ii , elector of saxony","9":"frederick augustus iii , elector of saxony"},"count palatine of the rhine":{"0":"louis iv , elector palatine","1":"louis iv , elector palatine","2":"louis v , elector palatine","3":"frederick v , elector palatine","4":"frederick v , elector palatine","5":"ferdinand maria , elector of bavaria","6":"john william , elector palatine","7":"charles albert , elector of bavaria","8":"maximilian iii , elector of bavaria","9":"charles theodore , elector of bavaria"}}