How to display only one post ?

Hello, i would like to display only one post in a special page.

I have different blog page, and i want in a special page (not on all blog page) to dispaly only the laste news (last post).

How can i do ?

I make a copy of the “template blog”
i wouldlike to change it :

<?php
/**
* @package WordPress
* @subpackage Aegaeus
*/

/*

Template Name: Blog LAST POST

*/
global $data;

?>
<?php get_header(); ?>

<?php
if (have_posts()) :
while (have_posts()) : the_post();

$exclude_cats = get_post_meta ( get_the_ID() , ‘hb_exclude_from_blog_categories’ , true );

$idObj = get_category_by_slug($exclude_cats);
$exclude_string = $idObj->term_id;

if ( get_query_var(‘paged’) ) {
$paged = get_query_var(‘paged’);
} elseif ( get_query_var(‘page’) ) {
$paged = get_query_var(‘page’);
} else {
$paged = 1;
}

// Content
if ( get_the_content() && is_page() ) { the_content(); ?>
<div class=”separator”></div>
<?php }

query_posts( ‘post_type=post&paged=’.$paged.’&cat=’.$exclude_string );
if ( have_posts() ) :
?>
<!– START .blog-wrapper –>
<div class=”blog-wrapper clearfix”>
<?php
while ( have_posts () ) : the_post();
print_blog_sidebar_post( get_the_ID() );
endwhile;
?>
</div>
<!– END .blog-wrapper –>
<?php
endif;

hb_pagination();
wp_reset_query();

endwhile;
endif; ?>

<?php get_footer(); ?>