Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_16278602_1 (_2008_ VARCHAR, population__january_1 INTEGER, largest_city VARCHAR)

### Question ###
What is the minimum population of the region in which Roskilde is the largest city?

### Accurate SQL ###

SELECT MIN(population__january_1), _2008_ FROM table_16278602_1 WHERE largest_city = "Roskilde"