oracle - SQL - How to select row by compare date from 2 table -

i have 2 table that:

table1:

id |    company_name  | rank |  first_regist_date    1                     1          2017-09-01   2           b           2          2017-09-05 

table 2:

 id | company_name    | rank  |   first_regist_date  1                      3          2017-09-03  2           c            4          2017-09-04 

i need select company data first_regist_date , rank in case of company have 2 first regist date, choose earlier date , rank greater (ex: company above have first date: 2017-09-01)

the expect result that: company - rank 3 - date:2017-09-01

please have me select in case

this technically answers question avoids elephant in room (which id takes preference?). both tables have id's may overlap ({b,c} have id of 2) rules need defined id takes preference other table id's renamed to.

    select company_name            ,min(first_regist_date) regist_date     (             select *             #table1             union             select *             #table2      ) t3     group company_name 

op dont change question (by adding rank) after question has been answered. changes: kindly contributed @toha

    select company_name           ,min(first_regist_date) regist_date            ,max(rank ) rank      ( select *             #table1               union             select *             #table2 ) t3      group company_name