you need to take care of ' single quotes.
something like this.
 
SQL> ed
Wrote file afiedt.buf

  1  create or replace procedure insert_test
  2  (p_in in varchar2)
  3  as
  4  begin
  5  insert into test values (p_in);
  6* end;
  7  /

Procedure created.

SQL> exec insert_test('castra''de augurta');

PL/SQL procedure successfully completed.

SQL> select * from test;

NAME
------------------------------
castra'de augurta

1 row selected.