heir                          status         relationship to monarch                       became heir                          reason                   ceased to be heir     monarch
0                 robert curthose                heir presumptive                             son                              1066              father became king                                1077   william i
1  succession unclear 1077 - 1087  succession unclear 1077 - 1087  succession unclear 1077 - 1087    succession unclear 1077 - 1087  succession unclear 1077 - 1087      succession unclear 1077 - 1087   william i
2                 robert curthose                heir presumptive                   elder brother                              1087                    by agreement                                1088  william ii
3                 henry beauclerc                heir presumptive                 younger brother                              1088             robert 's rebellion                       2 august 1100  william ii
4  succession unclear 1100 - 1103  succession unclear 1100 - 1103  succession unclear 1100 - 1103    succession unclear 1100 - 1103  succession unclear 1100 - 1103      succession unclear 1100 - 1103     henry i
5                  william adelin                   heir apparent                        only son                              1103                            born                    25 november 1120     henry i
6                 empress matilda             heiress presumptive                      only child  25 november 1120 proclaimed 1127                    brother died  1 december 1135 (22 december 1135)     henry i

Table as JSON:
{"heir":{"0":"robert curthose","1":"succession unclear 1077 - 1087","2":"robert curthose","3":"henry beauclerc","4":"succession unclear 1100 - 1103","5":"william adelin","6":"empress matilda"},"status":{"0":"heir presumptive","1":"succession unclear 1077 - 1087","2":"heir presumptive","3":"heir presumptive","4":"succession unclear 1100 - 1103","5":"heir apparent","6":"heiress presumptive"},"relationship to monarch":{"0":"son","1":"succession unclear 1077 - 1087","2":"elder brother","3":"younger brother","4":"succession unclear 1100 - 1103","5":"only son","6":"only child"},"became heir":{"0":"1066","1":"succession unclear 1077 - 1087","2":"1087","3":"1088","4":"succession unclear 1100 - 1103","5":"1103","6":"25 november 1120 proclaimed 1127"},"reason":{"0":"father became king","1":"succession unclear 1077 - 1087","2":"by agreement","3":"robert 's rebellion","4":"succession unclear 1100 - 1103","5":"born","6":"brother died"},"ceased to be heir":{"0":"1077","1":"succession unclear 1077 - 1087","2":"1088","3":"2 august 1100","4":"succession unclear 1100 - 1103","5":"25 november 1120","6":"1 december 1135 (22 december 1135)"},"monarch":{"0":"william i","1":"william i","2":"william ii","3":"william ii","4":"henry i","5":"henry i","6":"henry i"}}